You actually can't. The clock resets on a 24 hour cycle, so if you watch at a convenient time today, you can only watch the videos again 24 hours after the last one. So if you started at 7 a.m. today and ended at 7.20 a.m., you can only start again at 7.20 a.m. the next day, and so forth. It becomes more complicated if you watch in batches. Sometimes you lose track of the time, and you won't remember what time the clock resets the next day.
A simple x amount of videos per 24 hours, like it was done previously, is the easier solution.