Well in that case I think we will be seeing Space ports as maintenance facilities, I will try not see them as hangars, to me a hangar is something full enclosed, i cannot see big ships in hangars, maybe a berthing bay, similar to the shipyard docks. My point is I see mag missiles and box missiles as cargo loading in the same way you would load fuel provisions etc, I think the difference is you need a spaceport/hangar to do box reloads as it requires EVA to load them.
I see missile magazines as a prestack crate, that gets loaded into the cargo bay and moved into missile magazines. Box launchers need to be eva singularly and inserted then electronic tested for make sure there is a correct connection. This definitely would take more time, impossible to do without a facility possibility/probably
I think Balance box launchers yes you can launch them all in one hit, but they are a one hit wonder, you need to go back to base to reload, this make long term deployments not great, but also you can make box launch AAM as well to counter that punch, then have magazine launch missile ships in he fleet to carry on with long term or smaller engagements, so I do not see box launch missiles are too OP.
I see the maintenance platforms where you would load box missiles, and my assumption would be box launchers would be a normal cargo transfer for that ship, with maybe a little extra time included for reload. An hour per box launcher. But I do not see that as impacting maintenance, in the same way load food, fuel etc does not impact it. They are separate staff that do the jobs in parallel to the maintenance crews.