I would not have waited an hour. The one I see has only been late once and I called her phone about 10 minutes in and she answered and opened her door. She said she had not realized the time. If she had not answered, I would have left a message and gone on to do something else and would have expected to hear from the therapist within a day. I probably would have thought an emergency came up, she thought I had cancelled, or she was dead (she is quite old). As long as she apologized, it was not a problem for me.