I wash for one minute after the bleach step, and then for just over three minutes after the fixer step. I added these steps to the included instruction sheet so that I wouldn't forget them. I don't know if these wash steps are strictly required, but I read about them here, incorporated them, and get great results. It seems logical to me to wash after bleach and fix so that the chemicals undergo as little contamination as possible, especially since bleach and fix have such larger reuse life.