Estimating tasks would vary - trapping for packaging might require review before trapping, then trapping, then a proof. Of course, some in-rip trapping or application based trapping can be fully automatic, and many do not even add a line item to any invoice for that - other services like pagination or imposition also can vary from 'we need to examine and apply' to 'fully automatic'.
as per an hourly rate - saying 'we charge 60 bucks an hour' is meaningless. I could have a poster that rips in 15 sec and another that takes 15 minutes.
a quick examination of "rates" varies from 60 bucks to 150 bucks an hour.
Hope that helps.
Michael Jahn - Slightly used PDF Evangelist
Simi Valley California