I did some dry runs this week to test it out. Concealment garment was what I wear daily to actually conceal guns: an untucked shirt long enough to really cover them in daily activity.
Timer at 1.5, it was easy to draw/dry fire either my 92F IWB or the J frame AIWB. Set at 1.2 I could still make it with the J, probably not with the Beretta.
I don't have timer data, but in a class Tom Givens watched me draw-fire with the 92 OWB under concealment, and I had to be at 1.2-1.3 to make the number of shots. There is a difference between my OWB and IWB times though.