So long as the firearms themselves remain at the licensed location, I wouldn't think that there is a problem. I don't notify the ATF when I go to work, shop, or on vacation (when I am not present at the licensed location), I don't see that duration makes any difference. It just matters that the guns and the bound book stay there. Technically, you don't even need to have your "licensed location" be your home- it could be a special location specifically for that collection that you rarely visit.