Ok, let's see . . . I've been putting off answering this for awhile.
I'm in my 10th year dancing.
Did 1 year with first teacher, who then sent us to a studio because he couldn't take us much farther. There, did 1.5years or so with second teacher, changed partners and 2 years with third teacher. Partnerships changed again. Continued group classes with third teacher, started privates with fourth teacher. Stayed with fourth teacher for 4 years. It's now been a couple of years since I've taken lessons regularly due to lack of funds.
Since I've moved, my next lessons will be with teacher five, pending graduation and a full-time job.
This list does not count workshops, dance camps, or the 1-2 times/year coaching with a particular visiting pro that I've done.
(for the record, I've regressed quite a bit in the last few years, and now try to avoid saying that I've danced for as long as I have . . . grrr.)