Once every 2 months usually. I had to look at my calendar to be sure, and also noticed some 1 month spans. IIRC, I wasn't doing very well at the time. I'm always encouraged to call if things go sideways, but fact is, I don't. Phone phobic and always feel like I'd be bothering someone and don't believe I'm worth it (yeah, issues). It's one of my worst things as a patient -- I let things get really bad before reaching out.

I go to a place associated with the county. I don't know about response between appointments as, well, see above. But they do encourage me to reach out.

Back when I went to a private practice (with a PMHNP, so both my prescriber and therapist), it ranged quite a lot. For a long time, it was every couple of weeks, once a week in trouble, but started to get further apart (like 2-3 months) as my financial challenges increased. It was policy that you had to see her at least once every 3 months for prescribing of certain medications.