In one of the questions, I have noticed that Enterprise (NX-01) requires a crew of 100 people in order for the ship to operate.
We know that runabouts and ships like the Defiant can be maintained by much smaller crew, however, for the question to make sense, I would like to compare ships similar (more or less) in size and design, so I would like to limit it to starships named Enterprise.
Therefore, which Enterprise can be maintained by the smallest skeleton crew?
Canon and on-screen sources are preferred, however, if no information about a ship can be found, I believe technical manuals and other related works should be allowed as well.
A skeleton crew featured a minimal number of crewmen required for starship or space station operations, sometimes fewer. Skeleton crews were often formed during emergencies.
As for the questions for how long should a starship be maintained, let's agree on an emergency situation.