How much to expect for covering someones practice

I have a friend who has a fairly boutique private practice, and will need several weeks coverage over the course of the next year. What might be a reasonable amount to get paid for this? I think the practice has around 50 patients. I would be able to bill separately if someone needed to be seen for a visit.
Source: Student Doctor Network - Category: Universities & Medical Training Authors: Tags: Psychiatry Source Type: forums