I just came across a document a few days ago that said the official Minimum Connection Time for International to Domestic at BOM was 3 hours. 2 hours is going to be tight considering that the domestic checkin counters will close 45 min before the flight. Take away at least 30 min(if not more) if you have checked baggage on your arriving international flight and you're living dangerously.

Having said that, if your domestic flight is on Jet Airways, you can check in right after going through customs at arrival in either of the international terminal:

http://www.jetairways.com/MSIB21/Fro...ughcheckin.htm

Can't speak for the other domestic airlines, but the Jet Airways coach runs every 30 mins all night long.