Earlier quoted context omitted.
I was a mailman in Sweden for about 3 years in the early 2000s. One year full time, temping while doing uni for another two. Full time employees were salaried, with 8h work day averaged over a month. When work was done, you went home. If you worked 6h one day, 10h the next you would not get overtime. Overall, I would guess I worked about 80% of the monthly hours, and I never hit overtime. Longest day I worked was 13h…
Were you delivering mail or packages? Because apartment complexes around here usually have a set of letterboxes just inside or even outside the building, so the mailman doesn't have to climb to the 4th floor.
Sweden built a ton of housing (the goal was a million apartments in 10 years or so) back in the 50s and 60s. Those buildings didn't have letterboxes inside, all with letter gaps in the doors (at least where I worked). Newer places typically have them downstairs now.