anybody on here that can do sub 4 hours, no draft, without a tailwind, and no net elevation loss, should consider pursuing this for a career. One hour for a 40k won't win anything these days in a TT, but its still pretty decent riding. Putting 4 together puts you in pretty elite company. Consider that Landis averaged 320 watts on his solo effort on Stage 17. Depending on your size, and how aero you are, you're looking at something right around 300 watts or better for 4 hours to get this sub 4 hour century.