the longest I have seen belonged to one of my HS coaches. 10-11" long, thin, totally flaccid. the lockeroom discussion that day after practice was cock size, and I don't know if that had anything to do with him getting in the showers that day, but he did. out of approx 20 guys, about 6 of us were of decent size. the two biggest were of course, the above coach, and a student. he was thick, flaccid about 8".
Hot, man. I'm sure after that at least one team member started staying after practice for additional "drills".