I have a typical in front of the screen job, just walking to and from work and from meeting to meeting.
I found that 10000 steps were not much of a problem for a typical work day, if I consequently walked.
No elevator, no bus.
10000 steps should be about 4 to 5 miles or 6 to 8 km. I always thought this is realistic for a typical work day, but your comment made me thinking that maybe my tracker is just off. I should compare it to a GPS log one day.