My t used to run over, sometimes by 10 minutes, but during deeper work or a crisis, once by 45 mins. Usually it would be by 15 mins as I was her last client of the day.

It used to feel comforting that sessions ran over, of course if they did on occasion finish on time, it was easy to think she was fed up of me or angry with me, when in reality she had booked a client or friend after the session. It does play with boundaries a bit.