6' in a Day, there are 6 odd hours.- take day hours in 12 hour format, not in a 24 hour format. (1), 2, (3), 4, (5), 6, (7), 8, (9), 10, (11), 12 - 1, 3, 5, 7, 9, 11 are 6 odd numbers. '4' in a Week, there are 4 odd days.
What comes once in a year, twice in a month, 4 times a week and 6 ...