How Long Does It Take to Learn a Language? (FSI Hours by Language)
A realistic, data-backed answer using the US Foreign Service Institute's hour estimates — how long Spanish, French, German, Japanese, and Korean really take, and what speeds it up.
The honest answer is "it depends" — but that's useless, so let's give you real numbers. The best public benchmark comes from the US Foreign Service Institute (FSI), which has trained diplomats for decades and tracks how many class hours it takes English speakers to reach professional working proficiency (roughly CEFR B2–C1, "can work in the language").
Here's what the data says, and what actually moves the timeline.
The FSI estimates, by language
FSI sorts languages into difficulty categories based on how far they are from English. These are classroom hours to professional working proficiency, with similar self-study time on top.
| Language | FSI category | Approx. hours | Approx. weeks (full-time) |
|---|---|---|---|
| Spanish | I (easiest) | 600–750 | 24–30 |
| French | I | ~750 | ~30 |
| German | II | ~900 | ~36 |
| Japanese | V (hardest) | ~2,200 | ~88 |
| Korean | V (hardest) | ~2,200 | ~88 |
So reaching professional fluency in Japanese or Korean takes roughly three to four times longer than Spanish or French. German sits in between — the grammar (cases, word order) slows English speakers down even though the vocabulary is familiar.
These are hours to professional proficiency. The milestones that matter to most learners — holding a conversation, traveling comfortably, not freezing — come much sooner, often in the first 100–200 hours of focused, speaking-heavy practice.
What the numbers don't tell you
FSI hours are a useful baseline, not a verdict. Several things shift your real timeline dramatically:
- Languages you already know. If you speak a Romance language, Spanish and French collapse. If you know Chinese characters, Japanese reading gets a head start.
- How you study. 2,200 hours of passive review is not the same as 2,200 hours that include real output. Speaking-heavy practice reaches usable fluency far faster than input-only study.
- What "fluent" means to you. Ordering dinner and chatting with locals is a different goal from negotiating a contract. The first is weeks-to-months; the second is the FSI number.
- Consistency. An hour a day beats seven hours on Sunday. Language is a real-time skill, and real-time skills are built by frequency.
A realistic timeline to conversational ability
Forget professional proficiency for a moment — most people just want to talk. Here's a rough, speaking-focused timeline for an "easy" language like Spanish, assuming consistent daily practice that includes actual speaking:
- 0–1 month: survival phrases — greetings, ordering, numbers, directions.
- 2–3 months: simple back-and-forth conversations on familiar topics, lots of pauses, but communication works.
- 6 months: comfortable everyday conversation; you stop translating in your head for routine exchanges.
- 12 months: confident in most daily situations; opinions, stories, mild complexity.
For Japanese or Korean, stretch each of those out — but the order is the same, and the early wins still come fast if you practice speaking from day one.
The single biggest accelerator
Across every language and every timeline, one thing reliably shortens the path: speaking from the start, with feedback. Most learners delay speaking until they "feel ready," accumulate a huge passive vocabulary, and then discover they can't produce any of it. Starting to speak early — even badly — builds the retrieval skill in parallel with the knowledge, so the hours you put in actually convert to fluency instead of just recognition.
That's the whole idea behind Renza: short, daily spoken practice with an AI partner at your level, plus a report after every call, so the time you invest turns into the ability to actually talk. Want the per-language breakdown? See our guides for Japanese, Korean, Spanish, French, and German.
Frequently asked
Can I learn a language in 3 months? You can reach solid conversational ability in an easy language in 3 months of consistent, speaking-heavy practice. Full professional fluency, no — that's the FSI hours above.
How many hours a day should I study? Consistency beats volume. 30–60 focused minutes daily, including real speaking, outperforms long irregular sessions.
Which is the fastest to learn for English speakers? Among these five, Spanish and French (FSI Category I, ~600–750 hours). Japanese and Korean take the longest (~2,200 hours).
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