Movies are too short

I recently watched Harry Potter and the Half Blood Prince the movie and *start rant* IT LEFT SO MUCH OOOUUUT UUUGH!! I understand that they need to keep the movies in a nice time frame, but do you know how many people would be happier if they did the WHOLE book? I like to think of what it would be like if our culture was different. Just imagine if it was a normal thing to have about one, maybe two movies that come out a month, are probably continuations of the last movies that came out, and were about 10 hours long! You would think it normal so don't say "OMG thatd be soo weird!!11!" Cause no. It wouldn't. *new rant idea* YOU WOULD THINK IT NNNOOORRRMMMAAALLL NORMAL NORMAL!!!! I think it would be interesting and cool! EVERY SINGLE DETAIL would be in the movies!!! I'm in love with my creative brain...sigh.............*end rant*