いつまで学校に通うの？って英語でなんて言うの？

If you want to know how long a time someone will be somewhere then you can ask 'how long are you planning on studying in Japan?' but if you want to know when they will return or until when they are studying then you could say 'when are you studying until?'

If a person is studying in a foreign country, say he/she is from Thailand and is studying in Japan, the period of time he/she will take studying in the country will depend on the period it takes to finish the course. If it is a three year or four year course, that is the period of time the student will be studying in Japan. So, asking the student how long it will take him/her to finish his/her course can easily tell you how long the student will be studying in the country. So, you may ask the student as follows: How long will your course take in Japan? or For how long will you be studying in Japan?

"How long will you study in Japan?" "How long is the career you plan to study in Japan?" There are many ways you can ask this question but the most popular are the ones above. One is formal and the other one is not. If the person you are asking is someone you don't know you may want to opt for the second phrase. If it's a person you know, then you can use the first option.

This is a common question to ask in conversation and a polite conversation starter. There are many different ways to ask this question, and don't worry - even if you get it slightly wrong I'm sure the student will understand you! I would ask this question by saying "How long will you be here studying?". The here - implies that you are talking about Japan. You could also ask when their course will finish, how long their course is or informally 'how much longer to go?'. All of these examples are acceptable when asking how long someone will be studying for.

We ask 'how long' to know the duration of something or when it will end. We can ask someone how long they plan on staying in a certain location like Japan while they study, or how long their studies in Japan will last. The student can plan to stay for a year or two but natural circumstances can lead to the student staying longer or shorter than intended.

To a student who is studying in Japan, and you want to ask how long/until/when they are going to study in Japan, you may use one of the above suggestions.

"How long will you be studying in Japan?" A casual and well used expression, 'How long' can be used in different contexts' for example "How long is the drive home?" "How long until you are 21 years old?" "How long do you plan on being in Japan?" 'To plan' Is to look into something, to see and structure something in the future.