Why some languages take four times longer to learn

Ask ten people how long it takes to learn a language and you'll get ten answers, most of them a shrug wrapped in "it depends." It does depend. But there is one place that has been forced to give a real number, over and over, for seventy years — because careers and postings hang on it — and its answer is worth knowing before you pick a language or judge your own pace against it.

That place is the Foreign Service Institute, the US State Department's school for training diplomats. When the government needs someone speaking Thai in Bangkok or Arabic in Cairo by a certain date, it cannot afford "it depends." So the FSI keeps a table — decades of it — of how many hours of instruction a typical English-speaking student needs to reach a working level in each language. Lay those numbers side by side and something jumps out: the hardest languages take close to four times as long as the easiest ones. Same students, same school, same method. The only thing that changed was the language.

The school that had to keep count

First, what the number measures, because it isn't "fluency" — a word so slippery it's nearly useless. The FSI aims its students at Professional Working Proficiency: the level where you can work in the language, hold a real meeting, read a newspaper and follow the argument. On the scale the US government uses, that's a Speaking-3 and Reading-3; in the more familiar European framework it lands somewhere around B2 to C1 — comfortably past "getting by," not quite native. It's the level a diplomat actually needs, and a high but honest bar for the rest of us to measure against.

To reach it, the FSI sorts languages into a handful of difficulty groups. The figures below are the ones the Institute has long published, given here in weeks of full-time study and the class hours they roughly work out to:

• The easy band — about 24 to 30 weeks (≈600–750 hours). Spanish, Italian, Portuguese and Romanian sit near the bottom at roughly 24 weeks; French is a touch higher, around 30. These are the languages closest to English.
• German — about 36 weeks (≈900 hours). A cousin of English, but a stricter one: the grammar makes you work harder than the vocabulary suggests you should have to.
• The middle distance — about 44 weeks (≈1,100 hours). Russian lives here, in the company of Greek, Hindi, Polish, Turkish, Thai, Vietnamese and Hebrew — languages far enough from English to demand real rewiring.
• The "super-hard languages" — about 88 weeks (≈2,200 hours). That is the FSI's own blunt label for its top tier: Arabic, Mandarin and Cantonese Chinese, Japanese and Korean. Japanese is often singled out as the hardest of all.

So a native English speaker reaches the same working level in Spanish in roughly a semester of full-time study, and in Japanese in something closer to two years. The distance between them isn't effort or talent. It's how far the language sits from the one you already have.

Why the gap is really about vocabulary

It's tempting to explain the spread with the obvious culprits — an unfamiliar alphabet, tones, three genders, verbs that pile up at the end of the sentence. Those matter. But the quiet heavyweight is the one nobody dramatises: how many words you already half-know before you start.

Start Spanish as an English speaker and you are not starting from zero. Centuries of shared Latin and French history mean thousands of words are close enough to guess — nación, familia, importante, animal. These are cognates, and they are a standing loan against the vocabulary you'd otherwise have to build one word at a time. English and Japanese share almost none of that. Nearly every Japanese word is genuinely new — a fresh sound, a fresh shape, nothing to hang it on — and there are thousands upon thousands of them to meet before the language stops being a wall.

That's the real reason the hours multiply. Grammar, once learned, is a finite set of rules that eventually clicks. Vocabulary is not finite in the same way; it is the long tail of the work, the part that just keeps going. The further a language is from English, the less of that tail you get for free — and the more of those 2,200 hours are spent, at bottom, learning words.

You can master the grammar of a language in a summer. You spend the years on its words.

The honest catch: whose hours are these?

Now the part every clean chart leaves out, because it's the part that decides whether these numbers mean anything for you.

These are not casual hours. FSI students study full-time — around 25 hours a week in small classes, plus homework, often with time abroad — and they are adults selected in part for language aptitude and motivated by an entire career. That is close to the ideal learning condition, and it is nothing like twenty minutes on a train. So the honest reading of "600 hours" is not "six months and I'll be done." It's a floor set under near-perfect conditions — a measure of the language's intrinsic difficulty, not a promise for your Tuesday.

Which is oddly freeing. If your Spanish is taking longer than a semester, you are not behind; you are simply not a diplomat locked in a classroom, and almost nobody is. The FSI numbers are best read the way they were built to be read — relatively. They tell you Japanese will ask several times more of you than Italian will, so you can choose with open eyes and set your expectations to the language instead of to a stranger's highlight reel. As we've written before about the stubborn vocabulary plateau, the discouraging middle of any language is not a sign you've stalled — it's the shape of the work itself.

What all those hours are actually buying

Here is the thread that ties the easy languages to the hard ones. Whatever tier you pick, the single largest thing those hours purchase is vocabulary — a working store of words, met enough times and in enough contexts that they arrive when you need them rather than after the conversation has moved on.

The comforting arithmetic is that you don't need the diplomat's whole store to do a great deal. A few thousand well-chosen words covers most of ordinary speech, which is why conversational Spanish is a far nearer goal than the FSI's full working proficiency. And the words that matter most are the frequent, everyday ones — the load-bearing few that show up in nearly every sentence. Learn those first, in whatever language you've chosen, and you buy back a disproportionate share of the hours.

Where vocabla fits

vocabla can't shrink a language. Japanese will always ask more of you than Italian, and no app changes the distance between two tongues. What an app can do is make the biggest, longest part of those hours — the vocabulary — count for more per minute than it usually does.

So vocabla hands you words a few at a time, inside sentences that give each one a place to belong, and brings them back — spaced out, in context — until they stop needing to be summoned. It won't get you to the FSI's number this month. But it aims the minutes you do have at the part of the journey that actually eats the hours, in whichever language you've decided is worth them. Pick the language with your eyes open. Then spend the hours where they matter most.