Originally Posted by
CPH-Flyer
Arriving from the US, there is no transit security so you can be at the bus in about 5 minutes after exiting the plane. The will let you take the bus without actually having your boarding pass from SQ, but you should have print of your e-ticket handy.
Be careful there, this is not guaranteed. I've been in flights from the US where we had to re-clear security, and flights were we didn't. The difference between having time for a shower at the lounge and not having time.