How long is 91B ALC?

Have you considered, and it may be a crazy idea, to look in ATRRS? It will not only give you the start dates but give you the course length as well. Something to consider for yourself and to teach to those underneath you, rather than going out and requesting readily available information, do some research yourself first.

I am reserve just got a slot for phase 1 and 2 total class time 5 weeks 2 days

ALC at FT Lee was 8 weeks.