The honest answer is that it depends, and anyone giving you a single number for everybody is selling something.
If you are dealing with a specific problem, a stiff neck that will not settle or a shoulder that has been complaining for months, sessions closer together at the start tend to work better. Weekly or fortnightly for a few visits, then spacing out as things improve.
If nothing in particular is wrong and you are maintaining, most people settle somewhere between every three weeks and every couple of months. That is not a rule, it is just where people tend to land.
If you train seriously, your body will tell you. Many people book around their training block rather than the calendar.
The useful signal is not the date. It is noticing that you have started sitting differently, or that you are aware of your shoulders again, or that you slept badly for a week without an obvious reason. That is usually the point at which people realise it has been a while.
There is also no obligation to have a reason. Booking simply because an hour of quiet would do you good is a perfectly sound reason, and a fairly common one.
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