Depends on how fast you read, how much time you have and how much you enjoy the books. I would say 3 months is more than enough!
Depends on how fast you read. I'd say on average about 2 months.
Depends on how fast you read them! There are a total of 7 books in the series, with a couple of them being more than double the volume of others - the fourth (Goblet of Fire), the fifth (Order of the Phoenix) and the last (Deathly Hallows) are quite long. But as I said, it all depends on your reading speed... I am someone who can't put down an interesting book once I begin it, so the longest Potter book took me just about 48 hours to finish!
It honestly depends. I read them all in third grade I finished the first one in about three days the second about four days third about a week fourth about a week fifth a little more than week 6th almost two weeks and the final book was about three weeks.
But mind you I am and was a very very fast reader plus when I get into books I read them ALL. DAY. So it'll definitely take you a bit longer if you're not the type to stay up until 4am reading from early in the morning.
I'm a pretty slow reader, and not to mention I started in the beginning of second grade, but it took me about a year and a half to read all 7 books.