Grading difference Time split (mins)
A B
0 - 4 10 10
5 - 9 9 11
10 - 15 8 12
16 - 22 7 13
23 - 30 6 14
31 - 40 5 15
41 - 55 4 16
56 - 74 3 17
75 + 2 18
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