Last winter, I made a map of the parts of Oxford in which I would be likely to find myself over the course of a week.
Here is my approximate Ottawa map:
It is basically defined by three corridors, leading from my home to work, the grocery store, and the Rideau Centre. During the summer, it would certainly have a few more tendrils. That said, it is a safe estimate that 50% of my time is spent within the tiny (unmarked) rectangles of my cubicle and bedroom.