> maybe like 0.1% of people in SF are candidates for walking to work Everyone says SF is seven miles a side. Walking speed is maybe 3mph. If you want a commute

> maybe like 0.1% of people in SF are candidates for walking to work Everyone says SF is seven miles a side. Walking speed is maybe 3mph. If you want a commute of 40 minutes each way, you need to live at most 2 miles (straight line) away from your office. 0.1% seems low. Divide walking speed by sqrt(2) to be conservative about directness and you get about 20% of the peninsula within 40 minutes walk, and 40% of it within an hour.