Yes. Every single second. You decide.
Spending one minute more than necessary in the office means you decided to waste one minute.
If you like wasting time, waste your spare time.
Have you already reached all your achievements? Is your life so sad you have no better place to go?
Consultants have no silly signs reminding 12.18 (?) is time to go.
Knowing when it’s time to go is a remarkable success.
Or…are you the kind of guy who prefers being the last dumb leaving the office?