Icon has paid some theaters to keep this in theaters through Easter. The theater in a mall where I went to see this yesterday at a special college private screening has a sign on all the doors that says it will be in the theater for a minimum of 4 weeks. Never seen a theater put so much effort into letting people know a movie will be in a theater for so long.
I do not know if I can take seeing it again, but I may anyway. It is extremely powerful.
Here is the review thread (my review is post 137):
http://www.freerepublic.com/focus/f-news/1086228/posts GL does it with his SW movies. GL makes theaters keep it playing for a certain amount of time otherwise they can't get it. I believe the practice is common.