Edging is the engine of gooning. As long as you stay near the edge, the trance continues. The practical stop is a hard close: no “one more clip,” no “I’ll finish in ten minutes.” That bargain is the session.
If you are already in it, the win is shortening it, not pretending it never started. Close the tabs. Leave the room. Do the breathing. Mark the rest of the night as recovered. Tomorrow you start earlier.