Verified answer

どのくらい日本語を 勉強しているのですか

It means "how long have you been learning Japanese?"

It is kind of like "How much are you studying Japanese?" I don't know if it could be improved by saying ｛。。。 勉強したことがありますか？」　"(how much)... have you studied (Japanese)?" I don't know the difference exactly between 「勉強していますか？」　and　「勉強しているのですか？」.

I think if you said 「勉強しますか？」　"（How much) do you study (Japanese)?" that it could be correct for the habitual actions of a person. Like 「朝に学校へ行きます。」　could mean "I go to school in the mornings." I have the problem of not knowing how do we use such constructions in Japanese from the lack of experience. Now that they took atashinchi off Youtube, I don't know what I will do.?

It is ぐらい, isn't it?

"About how long have you been studying Japanese?"

DonoGUrai nihongo wo benkyou shite iru no desu ka.

どのぐらい*

You don't really need the no desu ka. You can say benkyou shite imasu ka, and that would project the same meaning.

Google translate does not work effectively on Japanese. Would these idiotic answers please stop! ANYONE KNOWS HOW TO USE GOOGLE TRANSLATE. WHY DO YOU THINK PEOPLE ACTUALLY ASK ON YAHOO ANSWERS THEN?

Thank you. You are correct on what it means.

Japanese to English translation:

'What are you studying Japanese and how much? '