There is MWD Handler Moms, but it is a small closed group and not very active.
The MWD course is 77 days. See http://www.navy.mil/submit/display.asp?story_id=64992.
Personnel completing the MWD Handler "C" School are required to perform duties in designated billets for a minimum of 48 consecutive months immediately following graduation. See NEC MA-2005 in http://www.public.navy.mil/bupers-npc/reference/nec/NECOSVolII/Docu... p. 69 (101 of 314).