Japanese phrase
___を勉強してどのくらいですか？ ___ o ben kyō shi te do no ku ra i de su ka
Meaning
How long have you been studying ___?
When to use it
Asks how long someone has studied a subject. It is a polite question often used in friendly conversations with classmates or new acquaintances.
Example dialogue
日本語を勉強しています。 nihon go o ben kyō shi te i ma su
I am studying Japanese.
日本語を勉強してどのくらいですか？ nihon go o ben kyō shi te do no ku ra i de su ka
How long have you been studying Japanese?