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Really? I thought Я занимаюсь плаваньем (my occupation or my hobby is swimming) is not equial to I've been learning swimming.

Interesting. I didn't know this. I don't see the way how to say it in russian without an insult. Technically "вы глупы"/"вы дурак" is a polite form of "ты глуп"/"ты дурак" but you can get a hook or...

"... вы занимались..."
заниматься - occupy(yourself), buzy
It's kinda "How many months have you been occupied by russian language?"
я занимался восемь месяцев (no need в)

EDIT: I've noticed...