what is your purpose of flushing...? you always want to let the soil dry a little before you give more water...but are you flushing for a finish or a deficiency...if for finish you dont want to give anymore nutes from this point on and dont have to wait very long to give more water..if for a def. you will want to wait a bit before adding more nutes..maybe 3-4 days at 1/4 strenght and bump it up from there.....