I've got a little lost somewhere, are we talking 747 classic or -400?
I think it's still about the classic, (I get easily lost) anyway the 25 minute cooling down period is after one full down and one full up cycle. It takes around 6 mins to go from 0 to 30.
If it is the 744 (I don't think it is) then alternate flaps are a completely different kettle of fish.