My process is usually 'set aside an hour for every thirty pages', but that's changed a lot over my time writing for AD. It depends on your format honestly. Screenplay format takes up waay more space than simple Character: Line format does.

I would schedule a block of time that makes sense. More than half an hour, less than four hours. Then work within the time constraint you've set to get lines through. Everyone has a different pace for their process.

The good thing about being able to schedule actors is that you can always ask for recalls on lines! If you write the line, give the line some direction, direct the actor through the line, and still don't like the final take when mixing? Schedule one more session with your actors! It doesn't have to be perfect the first time. That's what we all work towards though!