Lol, it's about 1.7 km one way to my daughters pre-school, so that ads up to about 7 km each day she goes. I probably don't walk as fast as you, and It takes a bit longer with a 4 year old too, plus the crossing roads/traffic lights. But then I'm not counting when I take a detour to the mall and wander around.
It doesn't seem like much compared to what your friend does, but it's a lot better than what I used to do. Before she started pre-school I would only walk once or twice a week, and not for that long either. 1650 days ago