sounds too good to be true - or you must be walking a LOT every day!
My average commute for a long while was around 30 minutes one way, 5 days a week with a backpack, plus walking to the grocery store a few times a week (10-15 minutes) and the occasional walk to the town center - about 50 minutes one way.
I'm in mid-Norway, so the terrain is hilly to steep inclines. The city is big for norway - about 180-200k people. I do a lot of walking in the cold - I'm not sure if that makes a difference or not, but some things suggest it does make a difference.