We were in Singapore in December. Immigration was very fast as it was the smartgates, however there was a problem with the luggage for the flight and we waited an hour for the bags to come out.Thanks, I did end up changing my QF81 to QF1 the day before. So we will be landing 9pm Singapore time.
Now to decide whether we go via immigration and get to a hotel by midnight or just book the expensive terminal hotel. Leaning towards a regular hotel. Some say 30min to collect luggage and clear immigration - sounds a bit too quick imo but I've never been there,