Can you over-pump in a session?

Laura • First baby born 6/20/19.

I have a tough time telling when my breast is truly empty, plus I’d love more milk in reserve and I can zone out if I put Netflix on while I pump 😉 So I’m nervous that I’ll be pumping and leave it on too long. Can you damage your breasts or hurt your supply if you pump “past empty”? Is there a past empty?? How do you know when to stop??