Yeah, and hour long lunch is pretty long. Most people I know take less time than that to eat at a restaurant, let alone just grabbing your sandwich from the fridge.
Get out of the building, take the bicycle to a park to eat, take a small nap and read a book, come back to the office fresh and mind reset.
This was my routine before I switched to WFH. Official hours where 9h to 12h, then 14h to 18h. 35h workweek, 2h lunch break, (France).
(Just highlighting that different people have different preferences. :))
Also, for some of us it's normal to go to a restaurant or to the pub for lunch. It's been years since I've eaten a packed lunch.