I agree that a T should treat different clients according to their different needs. However, I think a T regularly going over time is unprofessional. I think that all clients who pay X should get the same length of session for that payment. I think that is a boundary that needs to be maintained. This may be extended on very rare circumstances when a client is in crisis, but as a general rule, I think X dollars should mean a session of X length. Things like hugs, emails, amount of help vs tough love, etc can all be negotiated on a client to client basis.