I did the SIN-LAX on stop on SQ in 2006.. departed a bit late like 5:00PM and arrived early at 3:45 the same day

Also I think we had a serious tail wind too..

also remember pretty strong turbulance over Japan- to the point it woke me up and being from CA i thought it was an earthquake ..woke up all confused and searching for my desk to get under then realized where I was.. and went back to sleep and enjoyed the movement