I twisted my ankle once and had to limp home. I stayed off it for a couple of days then just tried walking and trotted a little at a time to build up to it. I've had minor injuries, such as blisters and stuff. If they were really bad, I'd give them enough time to heal well enough that a bandaid could cushin them further to allow me to continue. Just do what feels right. If it still hurts, don't do anything that adds to the hurt. If walking moderately doesn't make it hurt any worse, start there. If it DOES make it hurt worse, I'd even refrain from the walking. Try walking in a pool or something, to help support you more and take some of the weight off the foot. But you may ultimately have to do upper body or something until you can walk, and then run, on it without it causing pain.