The honest numbers, from the diplomat figure everyone quotes to what twenty minutes a day actually gets you in a year, and the one variable that matters more than hours.
The number you will find first is 1,100 hours. It comes from the US Foreign Service Institute's estimate of the classroom time a diplomat needs to reach professional working proficiency in Icelandic, and it gets copied from page to page as if it answered the question.
It answers a different question. This piece is about yours.
I have been learning Icelandic for a while now, living in Iceland, and my Icelandic is basic. I came to it with Croatian, my first language, and some Czech from years in Prague, both languages with cases, and I will say now that the head start was smaller than I expected. I can hold a simple exchange and I cannot follow a fast dinner. So I am not writing from the finish line. I am writing from the middle, with the numbers I have actually watched go by, which I think is more use than a chart.
It measures a full-time student, in a classroom, with a teacher, five days a week, aiming at a professional standard: negotiate, present, read policy documents. The Institute's own schedule is 25 class hours a week plus three or four hours a day of directed self-study, so 1,100 class hours is 44 weeks, about ten months, of doing almost nothing else.
Almost nobody learning Icelandic is that person. You have a job. You have twenty minutes on a bus and half an hour after dinner. And your goal is not to draft a treaty. It is to follow the conversation at a table, or get through a shift, or read a letter from the school without a translator.
So the 1,100 is an upper reference for a target you do not have, at a pace you cannot keep. Useful for one thing only: it tells you Icelandic takes more hours than French, and it does.
Here is the arithmetic for a real person.
Twenty minutes a day, every day, is about 120 hours in a year. Thirty minutes is 180. An hour, which very few people sustain, is 365.
Against the diplomat's 1,100, those look hopeless. They are not, because the goals are different and because not all hours are equal, which I will come to. But the honest framing is this: a year of twenty minutes a day is a tenth of the diplomat's budget, and it buys roughly a tenth of the diplomat's outcome, which turns out to be a great deal more than nothing.
What I have seen it buy, in myself and in people I know here:
After three months of steady twenty-minute days: you can read a word aloud correctly, you have a few hundred words, you can greet and order and thank and apologise, and you can hear that sentences have shapes even if you cannot make them.
After six months: you can build a simple sentence from parts, wrong endings and all, and be understood. You can follow a slow conversation on a subject you know. Children's news on the radio has started to have words in it.
After a year: a short news piece with a few lookups. A conversation about your work or your weekend, slowly, with patience on the other side. Some of the situations from your original reason for learning, done, however roughly.
After two years, on the same pace: the situations from your reason, most of them. Icelanders no longer switch to English at your first sentence. Fast group conversation is still hard. It stays hard for a long time.
Those are not promises and they are not a study. They are what the hours looked like from inside.
Two people can spend the same 120 hours and end up a year apart. The difference is almost never talent. It is what the hours were made of.
Hours spent on input at a level you can just barely handle, reading and listening to real Icelandic with a dictionary at hand, are worth more than hours spent on tables. The tables are the map. The input is the walking.
Hours spent speaking to someone who will not switch to English are worth more than any other kind, and they are the hardest to get in Iceland, where everyone will switch for you, kindly, the moment you hesitate. I have written elsewhere about the specific trap that living here sets. The short version is that the pressure other countries apply for free, you have to manufacture yourself.
And hours that happen are worth infinitely more than hours that were planned. This is the variable that dwarfs the others. Twenty minutes a day for a year beats an hour a day for six weeks followed by nothing, and the second pattern is the common one. The question is never really "how long does Icelandic take". It is "how long will I keep showing up", and the honest answer for most people is: longer than their discipline lasts, unless something makes them want to.
One more thing about the timeline that the hour counts miss.
Icelandic's difficulty is not evenly spread. The hard parts, the cases, the verb endings, the consonants, are concentrated at the start. They are a wall in month two and a fact of life by month eight. Whether Icelandic is actually hard has the detail, but the shape matters here: the first hundred hours feel like the least progress per hour you will ever make, and that is precisely the point at which most people conclude it is not working and stop.
It is working. The endings are being heard, below the level where you can feel it. I learned this with Czech, years before Icelandic, and it was the same: months of not perceiving the pattern, then a switch I could not locate, then sentences arriving with the endings on. The hours before the switch are not wasted. They are the price of it.
To arrive and function: no time at all, everyone speaks English.
To greet, thank, order and be a person to the people you see daily: a few months of twenty minutes.
To hold your own in a slow conversation on your own subjects: about a year of twenty minutes, plus deliberately engineered situations where nobody rescues you.
To sit at a fast table and follow it: years, and I am not there, and I am not going to tell you a number I have not reached.
To pass the citizenship test, a much smaller target than the diplomat's: the regulation bases it on the final goal of a 240-hour course for foreigners, which means handling daily situations, following simple conversations, and reading and writing short simple texts. As a rough guide, 240 hours is about two years at twenty minutes a day, or one year at forty. The test provider and dates change, so check island.is before you plan around it.
To "be fluent": I do not know, and I distrust anyone who gives you a figure, and the internet is full of people claiming ninety days who could not order a coffee at the end of them.
The hours are the whole problem. The grammar is a problem you solve with hours. So the real answer to how long it takes is: as long as it takes you to find a version of this you will keep opening. For me that turned out to mean building one, called Víkingur, disclosed as mine, and the only early result I trust is that I am still opening it.
Twenty minutes. Every day. The rest is arithmetic.