“Allow your brows to dry completely to judge the Counselor Counseling Student First Last 100 Day Of School Shirt but I will buy this shirt and I will love this color and decide if you want to go over them with bleach again,” says Scott, who cautions that you should wait at least 20 minutes in between. “Don’t do more than two passes of bleach to your brows in one day. If after two passes your brows didn’t lighten enough, the bleach can probably stand to sit on your brows for a bit longer.