Itinerary change

My itinerary follows the Davao-Singapore-Mumbai and back route and in my return I have 30 minute allowance to make it on the second leg. Granted the flight will not be delayed from Mumbai on midnight, there is a chance but I would have to run in the big airport in Singapore. But today, four days before my flight I changed that, and glad that the travel agency was cooperating. I may stay for several hours in Singapore, but it gives me plenty of time to make it to the next flight heading home, Davao.