Can you tell me what number of rhinoplasties a week/month should a plastic surgeon perform to be considered a good choice?

Depends: Most accomplished rhinoplasty surgeons do over 100 per year, yet this is not a number set in stone. If a surgeon is experienced they may work more part time, and do less than 100 a year, but they may be very accomplished. A better way to judge your surgeon is from other patient referrals, and your consultation where you want to look at their before and after pictures.