How long should I allow the primer to dry before applying the finish coat to the wall?

For your situation I'd wait 24 hrs regardless. I hope you used a oil primer like "Cover Stain" or the cheap Kilz product, masonite is a hard surface so there will be no penetration. The 2 primers I mentioned dry and can be top coated in an hour but still wait the 24 hrs. Good luck Les the painter

Depends upon the primer. Read the label to be certain. Latex primers are generally 3-6 hours, oil primers will state just a bit longer but it is best to wait at least 24 hours if topcoating with latex paint.

I always give it 24 hours to dry.

Oil-a day (24 hours) if you can spare it.

Latex- six to eight hours.