Originally Posted by Homeyba

I've done it 4 times. I ride about the same annual miles as you, 6-10k/year. I've never done an official 24hr race though. I did ride 386miles (600kms) in 22hrs once though so I'm about the same speed as you when I'm in shape. I've done the the Furnace Creek 508 eight times though.

The prevalent theory for RAAM racers isn't mega mileage, it's more quality over quantity. You build your speed up so that when you race you can ride at a higher sustained speed over a longer distance without getting anywhere near your red zone. If your goal is to do it some day, this year is better than next because next year you'll be a year older!