Recovery from Meditation When a person trains a muscle, there is a necessary recovery from training before one can train again. I'm wondering if there's such a thing with meditation sessions?

If so, how much time between sessions is necessary or even desirable? Are there guidelines in Buddhism about the length of pauses to take and the amount of sessions possible in a day?
More is better.  Period.  If you want some nuance to this answer, once you start getting above three hours straight in your sits, you start to get into diminishing returns.

The untrained mind and all of its obstacles and doubts is like a game of whack a mole.  You’ve got to keep swinging, every day, if you ever expect to make any progress.