In the contest countdown timer, the Hours field isn't displayed if it's zero, even if the Days field is greater than zero. So in the last hour before reset every night, the timer goes from "Ends in 02:01:00:00" (2 days, 1 hour) to "Ends in 02:59:59" (2 days, 0 hours, 59 minutes, 59 seconds, but looks like 2 hours, 59 minutes, 59 seconds).