The very second I met my transfernce T I trusted her. But not with the gender stuff until a few months after we started meeting. The one after her I was instantly unsure and wary of but I gave her a chance. The one after her I never trusted because she decided she wasn't fit to work with me after our second session and I got the sense she didn't like me because of the gender I identify as. My current T took about a month or 2. It was kind of off and on with her for awhile but I've been seeing her since October 11th and I trust her now.

So it depends. I often can tell fairly quickly if I'll click with someone or not but I do give people a chance.