hi... congrats on the job
most india flights r turnarounds however there was a layover in calcutta. most layovers r 24 hours however there are some great longer layovers... when i was there (only a few months ago) there used to be a 4 day layover in seychelles, 3 day layover in milan, 4 days in brisbane, 2 days in syd and singapore and 3 days in jakarta and a few others... there are layovers in dhaka (24hours) but it is also a turnaround sometimes as well... depending if u do the morning or the arvo flight.... hope that helps