It is one of ...
12:00, 12 and 12/13ths of an hour
1 and 1/11th of an hour, 1 and 11/13ths of an hour
2 and 2/11th of an hour, 1 and 10/13ths of an hour
3 and 3/11th of an hour, 1 and 9/13ths of an hour
4 and 4/11th of an hour, 1 and 8/13ths of an hour
5 and 5/11th of an hour, 1 and 7/13ths of an hour
6 and 6/11th of an hour, 1 and 6/13ths of an hour
7 and 7/11th of an hour, 1 and 5/13ths of an hour
8 and 8/11th of an hour, 1 and 4/13ths of an hour
9 and 9/11th of an hour, 1 and 3/13ths of an hour
10 and 10/11th of an hour, 1 and 2/13ths of an hour
11 and 1/13ths of an hour