Cripes what a load of confusion.
The 12 hours is an in port thing when the weapons have to be slid through a hatch in the hull, one can imagine some manual work and setting up the ramp is involved, you can't manhandle these things, a MK48 weighs over 1.5 tonnes and is hardly the right shape to try and grab hold of. Assuming you have to reload a full load of weapons, it must take hours, maybe even a whole day or something, each weapon being craned over the hull individually.
Reloading a single tube, given that it is done by mechanical means, I bet takes a few minutes at most.
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