Kinda depends on the particular knife in question. If you are constantly cutting stuff then stopping to wipe is probably not necessary unless the steel is VERY reactive. If it is then you might have to wipe it while on the same ingredient. I don't think the Kohetsu suffers from that though. Pretty much if you need to put the knife down for any reason, go ahead and wipe it before setting it on the board (on a dry spot! lol Wipe your board!
) then wash and dry when finished. If you don't have to put it down, just keep cutting stuff and wash/dry when finished. Keep a kitchen towel handy either on your shoulder or on the board if it is large enough and wiping the board or knife should be no issue. When you wash it though, go ahead and dry it with clean paper towels to make sure it is bone dry before putting it up.