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How Long Does It Take to Learn a Language?

FSI data puts Spanish and French near 600-750 hours and Mandarin around 2,200. Here is the honest maths on your weekly hours and CEFR target.

By Michael McGettrick7 Jul 202634 min read

How Long Does It Take to Learn a Language?

The short, honest answer: for an English speaker, reaching a solid working level (around CEFR B2) takes roughly 600-750 hours for Spanish or French and around 2,200 hours for Mandarin. Those figures come from the US Foreign Service Institute, which has been putting diplomats through intensive language training for decades and keeps the cleanest hour data anyone has. Divide the hour target by however many hours you can realistically study each week, and you have a calendar. That division is the whole answer. Everything else moves the number at the margins.

This article explains where those numbers come from, why languages differ so sharply, and how to turn an abstract hour count into a date on your own calendar.

Where do the FSI hour estimates come from?

The Foreign Service Institute (FSI) is the US State Department's training arm. It teaches American diplomats languages before they are posted abroad, in full-time intensive classes with professional instructors and small cohorts. Because the FSI has trained thousands of adult learners to a measurable standard, its published time estimates are the closest thing the field has to a controlled study of how long adults take.

The FSI groups languages into difficulty categories based on how long English speakers actually take to reach Professional Working Proficiency, which maps to roughly CEFR B2-C1:

  • Category I (about 24-30 weeks, 600-750 hours): Spanish, French, Italian, Portuguese, Dutch, the Scandinavian languages. Closely related to English in vocabulary and structure.
  • Category II-III (about 44 weeks, 1,100 hours): German, Indonesian, Swahili and others with moderate distance from English.
  • Category IV (about 88 weeks, 2,200 hours): Mandarin, Cantonese, Japanese, Korean, Arabic. The "super-hard" languages for English speakers.

Two caveats keep this honest. First, these hours are intensive classroom hours with a teacher, not self-study hours, so a self-directed learner should treat them as a floor rather than a promise. Second, the target is professional proficiency, which is a high bar. Conversational competence, the level at which you can order food, make small talk, and handle a shop or a station, arrives much earlier.

You can plug your own weekly hours and target language into the FSI time-to-fluency calculator to turn these category figures into a personal estimate in seconds. It does the division for you and shows how the finish date moves as you change your weekly commitment, which is the single most motivating piece of arithmetic in language learning.

Why does Mandarin take four times as long as Spanish?

The gap between a Category I and a Category IV language is not about grammar. Mandarin grammar is, if anything, simpler than Spanish: no verb conjugation, no grammatical gender, no plurals to speak of. The distance lives in two places.

The writing system is the first. Spanish and French share the Latin alphabet with English, so a learner already knows how letters map to sounds and can read a new word aloud on day one. Mandarin uses characters, thousands of them, with no alphabet underneath. Literacy alone is a multi-year project layered on top of learning to speak.

The sound system is the second. Mandarin is tonal: the same syllable said with a different pitch contour is a different word entirely. English speakers do not use pitch this way and have to build the distinction from nothing. It takes months of focused drilling before the tones become reliable rather than a constant source of error.

Add those two together and you get the three-to-four-times multiplier. It is not that Mandarin learners are trying less hard. The language simply asks an English speaker to build two entire systems, script and tone, that Spanish gives away for free.

How do I convert hours into a realistic timeline?

Take the hour target and divide by your weekly hours. That is it, but the honest version accounts for what you can actually sustain.

Say you are learning Spanish, with a 600-hour target to B2:

  • 5 hours a week: 120 weeks, about two and a third years.
  • 10 hours a week: 60 weeks, a little over one year.
  • 15 hours a week: 40 weeks, under ten months.

For Mandarin at 2,200 hours, multiply those calendars by roughly three and a half. Five hours a week gets you to B2 in about eight years, which is why serious Mandarin learners either go intensive or accept a long horizon.

Two adjustments make these numbers real. First, conversational milestones come far sooner than B2. A dedicated Spanish learner can hold a slow, clumsy but genuine conversation after 150-250 focused hours, which at ten hours a week is a few months, not years. B2 is the professional finish line, not the point at which the language becomes useful. Second, daily beats weekly. Twenty minutes every day retains better than a single long weekend session of the same total length, because the forgetting curve does most of its damage in the first 24-48 hours after study. Spacing your contact fights that decay.

What can I realistically achieve in three months, six months, a year?

Rough milestones for an English speaker studying a Category I language at around ten hours a week:

  • Three months (roughly 120 hours): solid A2. You can handle survival situations, introduce yourself, ask directions, order, and understand slow, clear speech on familiar topics. You will still freeze in fast native conversation.
  • Six months (roughly 240 hours): B1, the independence threshold. You can travel comfortably, follow the gist of media, and hold conversations that wander off script, with plenty of gaps and repair.
  • One year (roughly 500 hours): approaching B2. You can work in the language, follow most films and podcasts, and talk for an hour without exhaustion. Grammar is mostly automatic; vocabulary is the remaining bottleneck.

Scale those out by three to four for a Category IV language. The shape of the curve is the same; only the calendar stretches.

Does the method change the numbers?

Method matters, but less than people selling methods claim. A good approach, frequency-ordered vocabulary, comprehensible input, spaced repetition, and real conversation practice, will convert your hours more efficiently than a bad one, such as passively rewatching lessons or grinding an app that teaches "the elephant drinks milk" before it teaches "I want" and "where is". Call it a 20-40% efficiency swing on how much each hour buys you.

What method cannot do is change the order of magnitude. No app, no immersion hack, no sleep-learning gimmick turns 2,200 hours of Mandarin into 300. The claims that promise fluency in weeks are counting on you not doing the division. Do the hours, space them out, spend them on high-frequency material and real input, and the timeline above is what you get. That is not a discouraging answer. It is a liberating one, because it means the result is under your control and not dependent on finding a secret you have been missing.

Frequently asked questions

The answers to the most common questions about language-learning timelines are collected above in the FAQ block. In short: Spanish and French to a working level take an English speaker around 600-750 hours, Mandarin around 2,200, the difference is script and tone rather than grammar, five hours a week is a sustainable minimum, and B2 is the level most people mean when they say fluent.

Cross-references

Frequently asked

How many hours does it take to become fluent in Spanish?

The US Foreign Service Institute reaches professional working proficiency (roughly CEFR B2-C1) in Spanish in about 24-30 weeks of full-time study, which works out at around 600-750 classroom hours. That is with intensive tuition and small classes, so a self-directed adult should treat it as a floor. Conversational A2-B1, enough to hold a real if clumsy conversation, comes far sooner, often in 150-250 focused hours.

Why does Mandarin take so much longer than Spanish or French?

The FSI classes Mandarin as a Category IV language at around 2,200 hours, roughly three to four times a Category I language such as Spanish or French. The extra load is not the grammar, which is fairly simple, but the writing system (thousands of characters with no alphabet to lean on) and the tonal phonology, which English speakers have to build from scratch. Grammar you can learn quickly; a new script and a new sound system take years of exposure.

How many hours a week should I study a language?

Consistency beats intensity, but volume still sets the ceiling. Five hours a week is a sustainable minimum that will get an English speaker to conversational Spanish inside a year and to B2 in two to three years. Ten to fifteen hours a week roughly halves that. Below about three hours a week, the forgetting curve eats a large share of each session's gains, so progress feels disproportionately slow. Daily contact, even 20 minutes, retains better than one long weekend block.

What CEFR level counts as fluent?

There is no CEFR level literally called fluent. B2 (upper intermediate) is the usual practical target: you can hold a natural conversation with native speakers without strain, follow most media, and work in the language. C1 is advanced and near-professional. The FSI professional working proficiency they train to sits around B2-C1. A1-A2 is beginner survival level, B1 is the threshold where you become independent, and most learners who say they are fluent mean solid B2.

Is it faster to learn a language as an adult or a child?

Adults learn faster in the early stages, not slower. Adults have metalinguistic awareness, study strategies, and an existing first language to map onto, so they reach conversational competence in months where a child takes years of immersion. Children win on eventual accent and effortless intuition given enough time, but for reaching B2 as efficiently as possible, the adult advantage in the first few hundred hours is real. The myth that adults cannot learn languages is just an excuse.