I have a 13 mile walk if I need to get home on foot, which Google tells me would take a little over 4 hours. This is assuming that I am uninjured and things aren't all hosed up (which they probably are, if I'm walking home from work).

I have gear in my EDC Bag to make that hike doable, even with an overnight or two tossed in. I can also use this gear to SIP at the office for a few days. More if they share their supplies with contractors...