I agree with the 2 intelligent ladies above. Being able to pre-ride the course a week in advance is very helpful. I like to get the full 2 loops in, the first at a cooler pace the next at a warmer pace. Doing a full race cycle the day before a race is too much so the best you can get in is 1 lap. Also, for a place like Tymor, you may be able to drive up on back-to-back weekends but not back-to-back days.