Sitting here at work doing fuck all, everyone else has left but I still can’t leave for 45 minutes since I’m not at 40 hours

Seriously fuck this shitty 40 hour a week system, I got nothing to do and even if I did, no one wants to work at 5pm on a Friday when everyone else is gone. I so fucking hate being a slave to this random arbitrary number that was decided on 100 years ago