Help me figure out how to acquire my first two handguns...please! I'm so confused.

Here's my situation...
-I just got my handgun training course affidavit in the mail.
-I already purchased two handguns - one from OGC, the other from Magnum.
-OGC will be closed 12/22 and will reopen 1/4.
-I don't know Magnum's holiday hours.
-I haven't done my first trip to HPD yet.
So if I go to HPD tomorrow and apply for my permit, I'll have to wait until 12/25 - 12/31 to pick up my permit, correct? What happens if I pick up my permit on 12/27...do I have to get my OGC gun and return to HPD no later than Jan. 1? What should I do?

Is it a must that I return to HPD with my handguns no later than 5 days after I pick up my permit?