Such a subjective question its almost impossible to give a definitive reply
I have clients I've seen twice a year for 7 years, a few I've seen once a month for 6 or 7 years and others I've seen 10 times in a year never to be seen again, all 9f which an be classed as regulars.
Some clients feel like long lost lovers the moment they walk in the door, others never really click in that way, I had one regular I saw monthly for about 3 years, I was never 100% comfortable with him, he always edged his time a little over but other than that I couldn't put my finger on why I wasn't comfortable ashe was never disrespectfulor rude, till he booked an overnight and in the run up started to tell me he was going to make sure he got me drunk to see how far he could get me to go, how naughty I would be if I was pissed up, he stood at 6'4" an ex rugby player, I wouldn't have stood a chance.
Boom insta block and I now never question my gut instinct.