it all depends on the two different individuals involved, the harder the blows the more likely they are to bruise or worse in the hands of one that is too brutal or unskilled, i have had some bruises that didnt heal for weeks especially if the skin was broken (obviously this is worst case and not my idea of fun), best case you have no real bruises at all and or its better/ all healed in a couple days, of course individual healing times may vary and a number of treatments may help reduce the time required for some, cold water imersions, ice packs, nicey gell, alho vera, etc