Yes, Indonesian is easy to learn for the first few weeks, and easier than any other language of its size. Then it stops being easy, in exactly two places, and nobody warns you about either.
Here is the honest version: what you genuinely never have to learn, where the two walls are, and how long it takes to get somewhere useful. If you are still deciding whether to start, the reasons that survive a second look are the other half of that question.
What you never have to learn
Not “fewer forms”. None.
No verb conjugation. Makan is I eat, he eats, they ate, we will eat, she has eaten. The verb never changes shape for a person or a time. You are done with this forever, and the tenses lesson shows what replaces it.
No grammatical gender. No masculine tables, no feminine chairs. There isn’t even a separate word for he and she: dia covers both.
No articles. No a, no the, nothing to place. Buku is book, a book and the book.
No tones. This is the big one if you have ever tried Thai, Vietnamese or Mandarin. Say the word flat and you have said the word.
No new alphabet. The same twenty-six letters you are reading now, and words are pronounced the way they are spelled. Two things to fix, both covered in the pronunciation lesson: c sounds like the ch in ‘chair’, and e has two values you learn to hear inside a week.
Plurals by saying it twice. Buku book, buku-buku books. And most of the time you don’t even do that, because a number or a quantity word already tells the listener. The plurals lesson is one of the shortest on the site for a reason.
That list is not marketing. It is the reason a country of seven hundred languages could agree to share one. The full grammar overview has the rest of the system on one page.
Why the first week is genuinely fast
Because sentences are built by putting words next to each other, in the order you would guess, with nothing added.
Saya mau kopi ‘I want coffee’
Saya tidak mau kopi ‘I don’t want coffee’
Saya mau kopi? becomes a question by tone of voice alone
Compare that to your first week of French, where je veux already forces you to learn that vouloir has six forms and that this is the irregular one.
By the end of a first sitting you can greet someone at any hour, give your name and order a drink. That is real, and it is why Indonesian has its reputation.
The first wall: affixation
Then you meet a dictionary and discover that ajar ‘to teach’ is also mengajar, belajar, pelajar, pelajaran, mempelajari and diajarkan, and that they mean different things.
Indonesian moved all the work that other languages put into conjugation into a system of prefixes and suffixes. It is not decoration. It is the grammar.
tulis ‘write’ becomes menulis ‘to write’
baca ‘read’ becomes membaca ‘to read’
kirim ‘send’ becomes mengirim ‘to send’
The prefix is changing shape to suit the sound after it, the same way English says “impossible” but “intolerable”. Six rules cover every case, which is finite and learnable, and it is still the point where most self-taught learners stall. Start with what the affixes are before you start memorising individual words, because the word list is infinite and the system is not.
This is the wall the easy-language articles never mention. It arrives around week three, and it is the reason the affix system is worth meeting early rather than discovering by accident.
The second wall: there are two Indonesians
The language in your textbook is not the language anyone speaks.
What the book says: Apakah Anda mau minum sesuatu?
What you’ll hear: Mau minum nggak?
Saya becomes aku or gue. Tidak becomes nggak. Apakah disappears entirely. Whole verbs lose their prefix in speech: mengerti is ngerti.
Learners who study only the formal register hit this at the worst possible moment, which is their first real conversation. They have done the work, they know the words, and they still cannot follow a reply. The usual conclusion is “I am bad at languages”, when the actual problem is that they were taught one of the two registers and met the other.
It is fixable, and cheaply, by learning both from the start with a label on each. The saya and aku lesson is the first fork in that road.
What the hours say, and what they miss
The US Foreign Service Institute, which trains diplomats and has been timing this for decades, puts Indonesian at around 900 hours of classroom instruction to reach professional working proficiency. Spanish and French sit at roughly 600 to 750. Arabic, Japanese and Mandarin are at 2200.
So by that measure Indonesian is harder than Spanish, which surprises people who were told it was the easy one.
Both things are true, and they are not in conflict. The FSI measures the far end: reading a newspaper’s political coverage, handling a negotiation, catching what is implied and not said. That last stretch is long in Indonesian precisely because of the two walls above. Formal written Indonesian is dense with affixes, and it is a different animal from what you hear in a warung.
What the number hides is the shape of the curve. In most languages the first hundred hours are the brutal ones. In Indonesian they are the cheapest hundred hours you will ever spend.
So how long, really
No honest answer comes with a date attached, because it depends on how much you listen and how often you are somewhere people speak it. What can be said is what unlocks at each stage.
A weekend. Greet people, order food, ask a price, say where you are from. Enough that a warung transaction goes smoothly and people notice you tried.
A few weeks. Ask for directions, negotiate, explain that something hurts, understand simple answers. You will be understood far more often than you understand.
A few months. Follow a conversation aimed at you, if the other person slows down. Read a menu and a sign without help. Start recognising affixes rather than treating every derived word as new vocabulary.
A year and beyond. Follow two Indonesians talking to each other, which is a much higher bar than following someone talking to you. This is where the informal register stops being an obstacle and starts being the thing you actually speak.
The gap between the second and third stage is where people quit, and it is nearly always the affix wall or the register shock rather than a lack of talent.
The verdict
Indonesian is the fastest major language to start and a slow one to finish. If you want to be understood on a trip, it is the best return on a few evenings you can find. If you want to read Kompas and follow an argument between two friends, budget a real year and expect the affix system to be most of the work.
Either way, the first hour pays for itself. The beginner course starts with pronunciation and greetings, and both registers are labelled on every example so the second wall never takes you by surprise.
For what to actually use alongside it, every resource worth the money has the apps, tutors and books ranked, and fifteen facts about the language explains why it was built simple in the first place.