I think once a week is pretty standard for therapy sessions. Some therapists will taper it off to twice a month and then once a month to transition out of therapy. On the other hand, I've never seen this as some kind of magic formula...as if God handed down some stone tablets that said, "Thou shalt see clients once a week for 45-55 minutes at a time."

Some people are just fine with once or twice a month, and some people need many sessions a week.