Check out:

http://bikesebring.org/

And look at the RAAM qualify (no drafting)

That's a 24 hour TT

I don't like the lonelyness so I did the non-raam 24 hours... Kicking back and eating pizza I managed to knock out 425 miles in 2006...

Though the diamond frame RAAM TT record for this course I think is right at 500 miles...