If you can train on Pikes Peak, you should continue to train on it even during the week of the race. Just tapper during the 10 days- two weeks prior to your race. Tapering is not quitting, it's a decrease in volume. You want to have fresh legs for sure, but make sure your legs are prepared as well. If you are running 20 hours per week, you might want to throttle that back to 10 two weeks before the race of the race. Then, the week of the race, cut it back to 5 hours. You want to run the same intensity as your normal runs, just reduce the time (or miles) you run.