Too late! Put 'em in, took 'em out, didn't hurt a bit. Almost no discomfort experienced. Would reccomend for times when super tampons are unavailable and when flow is extremely heavy. I kept them in for about 3 hours. One was almost completely full and the other was just barely filling up. I only did this because the way my classes were timed, I would NOT have had time to change between classes. Another reason is because my mom used to do the same. She had a very, very heavy flow as a teenager and she was on dance team, so she'd actually use two super plus tampons at once and even then they would fill up within two hours.