In my opinion,pronunciation is the hardest thing in the study of language. It is impossible to have good pronunciation in a short time. I am sure perfect pronunciation is a matter of time

Quote (Perilova)
In my opinion,pronunciation is the hardest thing in the study of language. It is impossible to have good pronunciation in a short time. I am sure perfect pronunciation is a matter of time

I completely agree with you! If you want to have good pronunciation, you should work hard. You should do your best to achieve your aim. You should train a lot, because pronunciation is really important.

How much time do we need to have good pronunciation ?

As I said, a person should train a lot. You should do pronunciation exercises every day.
Or do you mean the exact period of time?

I agree with people who think that pronunciation is one of the most difficult thing when you study English. I think that if you want to have good pronunciation you should have a good teacher and do everything what he ask to do! I hope I will have good pronunciation!