How Long Does It Take to Learn a Language at 15 Minutes a Day? The FSI Math
Updated: 1 day ago
"How long does it take to learn a language?" is one of the most searched questions about language learning, and the honest answer depends on two things: which language, and how many hours a day you put in. There is a public dataset for the first part. The second part is arithmetic. We did the arithmetic.
The dataset: the Foreign Service Institute timelines
The U.S. State Department's Foreign Service Institute trains diplomats in dozens of languages and publishes how long that usually takes. Its language learning timelines give the time "usually expected for a student to reach an integrated score of 3 (Speaking + Listening)" on the Interagency Language Roundtable scale, which runs from 0 to 5. That is a high bar: a level at which someone can do their job in the language. FSI students are also not casual learners. A typical week, per the same page, is 23 hours in class plus 17 hours of self-study.
The four categories:
Category I, languages close to English: 24 to 30 weeks, 552 to 690 class hours. Spanish and French are listed at 30 weeks; Italian, Portuguese, Dutch, Swedish, Norwegian, Danish and Romanian at 24.
Category II: about 36 weeks, 828 class hours. German, Haitian Creole, Indonesian, Malay and Swahili.
Category III, "hard languages": about 44 weeks, 1,012 class hours. Russian, Hindi, Greek, Hebrew, Polish, Turkish, Vietnamese, Thai and many more.
Category IV, "super-hard languages": 88 weeks, 2,200 class hours. Arabic, Cantonese, Mandarin, Japanese and Korean.
The page notes that the actual time varies with natural ability, prior language-learning experience and time in class.
The computation: class hours divided by 15 minutes a day
Fifteen minutes a day is a common goal for app learners, so we used it as the unit.
15 minutes a day is 0.25 hours.
Over a year: 365 × 0.25 = 91.25 hours per year.
Divide each category's class hours by 91.25.
The results, counting class hours only:
Italian or Portuguese (552 hours): 552 ÷ 91.25 = 6.0 years
Spanish or French (690 hours): 690 ÷ 91.25 = 7.6 years
German (828 hours): 828 ÷ 91.25 = 9.1 years
Russian (1,012 hours): 1,012 ÷ 91.25 = 11.1 years
Japanese, Korean, Mandarin or Arabic (2,200 hours): 2,200 ÷ 91.25 = 24.1 years
Those numbers leave out FSI's self-study. If you add the 17 weekly self-study hours back for Spanish, the full workload is 30 weeks × 40 hours = 1,200 hours, and 1,200 ÷ 91.25 = 13.2 years at 15 minutes a day. Doubling to 30 minutes a day halves every figure: Japanese class hours alone would still take 2,200 ÷ 182.5 = 12.1 years.
Another way to see the gap: one FSI class week of 23 hours equals 23 ÷ 1.75 = about 13 weeks of 15-minute days. A full year of daily 15-minute practice adds up to about 13 percent of the Spanish class hours (91.25 ÷ 690) and about 4 percent of the Japanese ones (91.25 ÷ 2,200).
What this does and does not mean
It does not mean 15 minutes a day is pointless. It means "fluent in three months" claims are measuring something other than what FSI measures. Three things are worth keeping in mind.
The target is very high. Level 3 is near the top of a 0 to 5 scale. Ordering food, asking directions, reading a menu or chatting with a relative who speaks the language sit far lower on the curve, and they arrive much sooner.
Classroom hours are not interchangeable with every kind of practice. FSI hours are intensive, taught, and focused on speaking and listening. Fifteen minutes on a phone is a different thing. The table is a ceiling for planning, not a forecast for any particular method.
The real risk is stopping. A habit that survives seven years beats an intensive one that lasts three weeks. The arithmetic only works if the minutes keep happening, which is why a format that shows up on its own matters more than a format that is slightly more efficient per minute.
A goal you can actually measure
Instead of "be fluent," set a goal the FSI numbers can support. For example: answer one message a day in your target language, for a year. That is 365 times you produced a sentence, had it checked, and read a correction. You can count those. You cannot count fluency.
That is the idea behind Language Textapp. Every day, at a time you choose (9am unless you tell it otherwise), it texts you one short message in the language you are learning, pitched at your level. You reply in that language. It sends back the corrected sentence, one or two fixes explained in plain English, and a reply that keeps the conversation going. A real exchange at beginner level looks like this:
App: ¿Qué comiste hoy? (What did you eat today?)
You: Yo comí tacos en la almuerzo
App: ✏️ Yo comí tacos en el almuerzo. Use 'el almuerzo' (masculine). ¡Qué rico! ¿Te gustaron? (Did you like them?)
Beginners get the English meaning in parentheses. If you are learning Japanese, Korean, Mandarin, Russian or another language with a non-Latin script, beginners and intermediates also get the romanization, and you can reply in romanization too. Given that the Category IV languages carry a 2,200-hour price tag, removing the script barrier at the start is a reasonable trade.
You can ask it, in your own words, how you are doing, and it tells you how many days you have practised, how many replies you have sent and what your most common slips are. That is the measurable goal above, kept for you.
Some honest limits: it is an AI, not a person or a teacher, and it can get things wrong. There is no audio or voice, so it will not train your listening or pronunciation. It is a daily writing habit, one piece of the 690 or 2,200 hours, not a replacement for them.
Try it by text
Text Hi to (385) 525-5598. It asks which language you are learning and whether you are a beginner, intermediate or advanced, then sends your first message. After that you get one message a day at 9am, or tell it to text you at 7pm instead. Ask it to make things easier or harder whenever you like.
It works on any phone that can text, with no app to install and no account to create. Your first 20 messages are free, then $9.99/month covers every Textapp. Text STOP at any time to end messages. Message and data rates may apply. More at textapp.co/apps/language.
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