3, 4, or what? At what point does the work suffer?

3 or 4 sounds good or 1 gangbang scene, maybe 2.

as a performer or director or what?

If its really good porn as a fan boy i only need about 5 minutes of the right part tops.
as a performer 1
as a director depends on what your shooting.

I was asking as a performer. Have you done more than one scene in a day as a performer, Kami?

As a performer, more than 2 is pushing it. As a director,5. But that is one hell of a long day.

i have never shot more than 2 scenes in a day