The real reason why this movie was so long
Is because it had 3 different story lines.
1. George a famous comedian/Actor is dying & want to set things straight
2. George a famous comedian tries to get back with his Ex while she still has a family
3. A young comedian gets an opportunity to learn from a huge comedic star while being his assistant
So as you see 3 movies could be made out of what Funny People did.
The new movie starts when he gets healthy & wants to get his ex.