All kinds of crazy hours when running relays.
The best was probably the Detroit airport around 3 am. Was traveling for Thanksgiving, had a flight canceled, got rebooked through Detroit, that flight was delayed, etc. My second flight didn't leave until 7:30 am or so, and everyone else arriving at the airport (we were the last flight in that night) was at their final destination. I put my carry on in a locker, back when lockers were still a thing, and ran around those moving walkways at what felt like 4:40 pace.