The T2K maintenance hours don't really work for large vessels like a ship or submarine. Unlike a truck or tank they don't pull over to get repaired, they're under constant maintenance by the crew. So the maintenance number isn't germane unless you've got less than the minimum crew.
I'd treat each major component as a "vehicle" for rolling maintenance. Every day each component gets three breakdown checks with the attendant repair checks. That's going to be tedious in actual play if you're crossing an ocean. Maybe just come up with an encounters table for open water. Some "encounters" will be maintenance checks needed on some major component.
There's not a lot of ship-to-ship action in T2K, a submarine (or other large vessel) is like a mobile home base from which to launch missions.
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