1. I am on post-doc now, so I don't have a lot of firsthand knowledge, but from what I have observed:
Per week:
College Counseling Centers: 15 individual sessions, 1-2 groups, 1-2 outreach presentations, 2-3 (?) intakes, and a few hours dedicated to supervising practicum students and/or interns
The colleagues I worked with in other settings weren't "full time therapists" per say, and did a bit of everything, including assessment and consultation. I know the state hospital setting required 7ish groups per week, but didn't have any other "requirements" per week.
2. Not really. Aside from booster/maintenance sessions, biweekly is the least amount of frequency I would put between sessions on a regular basis with someone with active issues. 3-4 weeks between the average session makes it hard to retain and build on the information learned in previous sessions.