[cdtwigg]

While this is possible, longer credits mean more filmstock to be duplicated and fewer showings per theater screen, so there is an economic incentive to keep them as short as possible. I know when I worked in the VFX industry an artist had to clock a certain number of hours on a given show to be given credit for the work.

[baddox]

Surely the difference is nearly negligible. With the exception of movies with popular after-credits scenes, I assume people leave when the credits start anyway, and I suspect the employees can begin cleaning when people clear out even if credits are still running.