How long should a check-up slot really be?
Fixed 30-minute slots waste more chair time than most owners expect. Try timing a week instead.

Most clinics inherit their slot lengths from whoever set up the diary years ago.
Time one ordinary week. You will usually find check-ups run short and new patient visits run long.
Match the slot to the visit
Two or three lengths are enough. Set them once for each treatment, and let the booking page offer only times that fit.
Where to start
A small clinic can start this in an afternoon. Change one thing, watch it for two weeks, then decide whether to keep it.
