I always keep the extra, that you dont use, and check to see how its hardening up. If the action screws go through the new bedding and into the action, ill pull those after about 10 hours, before the epoxy has fully set up, because i want to be sure the action screws will back out and are not seized into the action. Pull one at a time, clean the screw, re-apply release agent and put the screw back in. If you are using inletting screws, there's no need to do that. With a proper glass bedding job, you always want to be patient, but should also be mindful of things.