I would give them between 3 to 5 sessions (5 being generous).

How to test a new T? Listen to your guts, your felt sense of T, the connection you feel to them as a person. And also IF you can work with the boundaries they set - I think that is equally important as some may be deal-breakers.

And yes, 5 months is a long time to not feel a connection. I would say time to move on..