4 - 7 days is the cure time. 2 hours is the recoat time. Note- the recoat time is not the same as the "apply other paints over it" time.
What are you planning to paint over it?
Emulsion should be fine the next day. Oil based paints should be fine the next day. Waterbased gloss/satinwood/eggshell, wait a couple of days otherwise you might see fisheyes in the finish.
Probably best to phone the Zinsser technical support line - 01914106611
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