That's all the time it took me today from the moment when I stepped out of flight TG-510 (5 min ahead schedule) to my place in Sukhumvit/Nana area. 

30% of this time was spent walking inside the airport terminal building from concourse C to Immigration counters.

Airport limousine costs 900 THB but Taxi Meter are available on level 1, so no need to go to the shuttle linked transportation center.

 A large serie of photos of Suvarnabhumi airport before official openning are available on Mcot web site.