Relay Exchanges are at mile lengths 3.5, 6.7, and 10.0.
Relay Leg Lengths: Leg 1: 3.5, Leg 2: 3.2, Leg 3: 3.3, and Leg 4: 3.1.
The first leg is the longest, the second leg is the hardest (mainly uphill), the third and fourth legs are the easier of the four legs.