I don't know enough to say exactly; I am just extrapolating from my own program. During the winter and early spring my coach had me doing lots of 1x60' and 2x20' intervals. During late spring, it's been a lot of 3'+3' over/unders. Now as I am racing nearly every weekend, he has my midweek volume way down. Either I am doing easy 60' rides (usually an extended commute) or very short-interval power work.
I am riding a lot fewer miles, but the miles I do ride are a lot harder.