I was also visualizing the round analogue clock face, but didn't want to muddy the water by saying "twice" when I guess it's technically only once, just no am/pm delineation.

I am puzzling over this at work now. I guess a fast clock could be right almost infinite times a day if it ran fast enough, but a slow clock can only be as slow as a whisper faster than stopped, which would mean it could be right alllllllllllllmost twice a day, but never twice a day.