Khalid Sheikh Mohammed Was Waterboarded 183 Times in One Month.
Note, the information comes from the CIA IG report which, in the case of Abu Zubaydah, is based on having viewed the torture tapes as well as other materials. So this is presumably a number that was once backed up by video evidence.
The same OLC memo passage explains how the CIA might manage to waterboard these men so many times in one month each (though even with these chilling numbers, the CIA's math doesn't add up).