@FG - I'm not trying to explore if it's a good policy or bad policy - it is what it is, and benefits some while challenging others. If I have an emergency, then no, I can't be fit in if there's no cancellation. If T has 25 clients and 20 spots, then next available is likely to be in about 7-10 days. A private practice T can work 50-60 hr in a week when there is a need; mine is limited to a 40 hr week.

@Sunrise, I think that's probably the most common - some clients are weekly, some are every other week, some are 2x, and most T's have the freedom to offer a recurring appt to some and flexible scheduling for others.