This number is the cycle in which Earth Time and Vanadiel Time repeats. There are 56 Days in 8 weeks in order for the same Vanadiel day to start over at JST (0:00:00). Also there are 25 Vanadiel days in 1 Earth Day. 25/8 = 24, with a 1 day remainder. That remainder must carry over to the next day, which each Vanadiel week shifts to the next Earth 24 Hour period.