Input: [[1,2,3,4,5,2,1,2,5,5,4,3,2,2,1,1,1,2,3,4,5,3,2,1], 3]
Output: 8
Hours 8-10 (5,5,4) have the highest average of 4.67
Input: [[1,1,1,1,2,2,3,3,2,2,1,1,1,1,1,1,1,1,1,1,1,1,1,2], 4]
Output: 5
Hours 5-8 (2,3,3,2) have the highest average of 2.5
Input: [[3,2,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,2,3], 2]
Output: 22
Hours 22-23 wrap around to next day, [2,3] has highest average