Assuming 250 work days (50 weeks * 5 days), that's 40km/day.

I don't think most people bike at 40km/hour.

Across a year, that averages to 27.4 km per day, biking each and every day.

If done in an hour, that's rather faster than my average biking speed of about 16 kph.

I said more than an hour. I think an hour on a bike is something most people can stomach easily, but it gets annoying fast once you go above that.