I don't know about automatic limits on miles, but I do know I plan on limiting my daily driving to about 300 miles early next year when I head cross country.
However that is not a hard and fast rule. For one thing, if I'm still feeling good, and there is still plenty of day light left, I could go further. on the other hand, if I'm a little tired, or a good place to stop is a little short of 300 miles, but the next best place to stop is a lot of miles further than 300, then I'll stop early.
The biggest benefit of being retired next year is I don't have to rush to be at any place, and I don't have time constraints on when I have to return.
