Well, BOM or other major indian airports were 2 hours ++ if you had to wait in line to scan your bags and strap them before checking them in.

Right now that part is cut out and there's just security. Is there still a priority F line at BOM immigration? If so security is your main pain and there aren't that many international flights likely to leave near noon, most of the flights out are midnight. I'd say an hour and a half should be ample, or a bit more - the new lounges at BOM are quite decent.