A FlyerTalk Posting Legend
Join Date: Sep 2009
Location: Minneapolis: DL DM charter 2.3MM
Programs: A3*Gold, SPG Plat, HyattDiamond, MarriottPP, LHW exAccess, ICI, Raffles Amb, NW PE MM, TWA Gold MM
Posts: 100,404
I would have said two hours to allow for problems.
SQ should keep the bags (checked through) at SIN if everything is on a single ticket/PNR, assuming that all segments are SQ operated. If not, the airport has some baggage storage facility, but I don't know the details.