How long does it take for a bruise on my foot to heal?

You might have pulled a muscle, as well as bruised your foot since it is swollen. If you can walk on it and it doesn't hurt as much then there is probably nothing seriously wrong with your foot. If it is just a bruise then it'll be gone in about a week. It only hurts to walk because there is a bruise there. Once the bruise is gone, you'll be fine. Plus, since your foot is already getting better, I'd say you have nothing to worry about. If it does get worse over the next couple of days, then you might want to see a doctor and they may give you some pain medicine. I highly doubt you will need a cast or anything. BTW, if you had happened to pull a muscle just take a hot bath every night and let the hot water relax your foot muscle. It takes about a month for a pulled muscle to heal, with using it as you normally would. If you baby it (treat it with a lot more care than needed) then it will take even longer to heal, so your best bet is to ignore it unless it gets worse. :) Hope my answer helped! :)