not really.
The maintenance clock of a ship will only count up if it's "in space" and away from a planet with enough maintenance facilities to support it. Also, you can "overhaul" a ship to reverse the clock.
When I started, an early mistake I made was assuming that "maintenance life" was the total lifetime of my ship. So for example a maintenance life of 5.24 years meant that after that point the ship would be useless and I'd have to build a new one. Not so.
more appropriately, a ship with a maintenance life of 5.24 years means "This ship can fly around in deep space for 5 years without much breaking on it, but after that it will have to sail home for repairs."
most of my ships have a maintenance life of 2.0 years and that's even pretty long by some people's standards. My ships orbit inhabited worlds with large maintenance facilities and put into space to fight aliens a few months away at most. Every 3-5 years, I overhaul a starfleet.