Keep in mind I am primarily interested in DJ-oriented music, which is not music designed to be listened to beginning-to-end, but rather mixed and beat-matched with other music. You can often get the gist of a beat and rhythm in a matter of bars. I'll usually click around a track for 5-10s before I repost it, and move on to the next track. When I'm ready to actually listen, I go back to my profile and play back everything I've reposted for the day, and unpost the stuff that doesn't stand for the full length of the track.