how long after sticking hardiebacker on floor can i walk on/tile over?

[aflemi]

Just glued'n'screwed 6mm hardie onto 12mm ply with keraquick, now home for breakfast.......... how long do i have to leave before walking on/tiling over?
Cheers.........

 

[Deleted member 9966]

how long does keraquick usually take to go off? about 4 hours? go by what it says on the bag.