Will you always need more than one HT?

I'm going in for a procedure with Dr Bisanga in February. Just to do some temple work and lower my hairline just slightly. Estimated number of grafts 2,200 maximum.

I'm a NW 2.5 heading towards a 3. So what should I expect in terms of density and end result assuming everything goes to plan? Given in the scheme of things my MPB is still in the early stages...

Is it just a rule of thumb that you won't get the desired result in one surgery and you'll need to go back for more eventually?

Dr. Bisanga wouldn't do the surgery unless he thought you were a good candidate. What Bisanga told you should be correct he is one of the top surgeons in the world. If your hairloss is progressing very slowly it could be many years before you need another one.