I;m going to leave my well pump running all night long.....

… to fill the remaining foot, or so, in my pool.

Am I crazy? I’ll check back in the A.M.

Provided your pump is sized correctly for the flow your well produces it’s a non issue.

If your pump can out pump the well, it can and most likely will cause damage left running.

I have pumps in service that run near continuous for the entire summer.