The gestation period can differ a lot. Depening on how many baby's a species get. Which with Bradypodion can go from 1 to 3 in season. Gestation in Winter is always longer then in summer. So for these clutches 5 -6 months is logical and in summer 3-4 months is possible.
I'd like to make a guess when I see pictures of the females. I guess Chris is right with end of September but I'd think even more chance for October. But that would be with gestation in Winter, with you guys it's summer now so it could also go much faster.
Very beautiful animals Chris.