Adding all the days I spent 읽기 each book together, I'd say roughly 2 months. 3 days each for PS and CoS, another 5 for PoA, a week and a half for GoF, 2 weeks for OotP (kinda slow at first, but once 당신 get halfway through 당신 can't stop), a week and a half for HBP, and almost three weeks for DH(guess I just didn't want it to end.)
PS-1 day CoS-2 days POA-1 년 (School book only got to read it when I was finished work so I had very messy handwriting but it was worth it) GoF-2 and a half weeks OotP-5 days HBP-3 월 (Thanks a lot damn homework!Stopped me from finishing it quicker!) DH-2-3 years (I kept getting to a point and the book always ended up soaked in the sink,snow and puddles)
And I keep 읽기 the Chamber of Secrets as I am addicted to the book