I don't have CLEAR, however, I have flown out of ATL several times in the past year. I have PreCheck, so I have a pretty good view of the CLEAR line. It is always shorter than the PreCheck lines and they seem to have their dedicated TSA document checkers (I have no idea what the TSA screeners check for the CLEAR members as CLEAR verifies their identity). A week ago Friday, at about 2:30 pm, there were close to 100 people in the PreCheck line and no more than a dozen in the CLEAR line during the 20-25 minutes that I waited to be seen by a TSA document checker. The wait at the CLEAR line could not have exceeded 5 minutes at any given moment.