Don’t you include commute in the workday? If you have 30 min to office (1h in total), and have a 7h workday, then you only need to be in office for 6 hours. And 1h of them is probably lunch?

If company allows work from home, then they will probably maximise the number of “work” hours, as you don’t have a commute and lunch is probably quicker.

(This is how it should be, but yes I’m joking)