Answer:
50 mins
Step-by-step explanation:
50 mins is absolutely enough if you stay with the same airline and don't have to car about your luggage or immigration. Unless your flight is late, and as mentioned above, SIA will put you on another flight if you miss your flight due to a delay.
Airlines don't come better than Singapore Airlines. If it can be done within a 1-hour layover, then it will be done at Changi. However: ... You'll almost certainly have to go through security again at Changi, though they're very efficient and very nice about it.
