I don't know if all post offices do this but... TL;DR the letter carriers are tracked and monitored very closely. Depending on your supervisor, I can see how that could be very stressful So the woman who used to deliver my parents had an interesting tale. Queenie delivered my parents neighborhood for years. The town I grew up in didn't have street mailboxes so the letter carriers would park the truck and walk to a few houses, get back in the truck, move up the street a little, rinse repeat. One day they see her name in the news paper because while delivering up the street, she noticed a strange noise coming from inside a house. Luckily the door was unlocked and when she poked her head in she finds an elderly woman lying on the floor at the bottom of the stairs who had just taken a bad fall. Quennie calls 911 and stays with the woman until the rescue squad gets there. Then she goes about her route. A few days later she gets back to the post office, she is confronted by the postmaster about why she took so long at this house? Turns out she has to carry a GPS tracker so they can monitor where she is and to make sure she isn't stopped anywhere for too long. And that's actually the reason the store got to the paper. Quennie wasn't telling anyone what she did and she was actually quite shy about the whole ordeal. When the post office went to confirm her story with the rescue squad they realize that she might have saved this woman's life. My parents tried talking to her about it, telling her how great it was and she brushed it off as nothing. She almost seemed embarrassed by the attention.