I can't believe it, but I finished all 652 pages of Harry Potter and the Half-Blood Prince in five days. I'm in the middle of reading other books (Let it Blurt, Live from New York, Complicated Shadows, Please Kill Me), but those had to be put on hold. The book is so good: it's evenly paced and there are no major slow-downs. Story-wise, like all the other books, more answers are revealed as more questions pop up.
Of course, there are enough clues and hints about where the next book is heading, but there is so much that is up in the air. Rowling has not said anything about when the next book will come out, but if it came out today, I would drop everything and read it.
What amazes me is the amount of time that it takes for people to finish reading these books. In the case of Half-Blood Prince, a friend of mine finished it 11 hours. Another friend of mine finished The Sorcerer's Stone in one night. For me, it took me weeks to finish the other books. Since I usually reserve reading books for when I'm about to go to sleep (reading makes me sleepy regardless of how interested I am in the subject or story) and have to visualize everything I read in my head, reading takes a long time for me.
I wonder how long it will take for people to read Post. Hopefully longer than one night.