Texel 2004 when the broke the round record by no less then 20 minutes. The old record stood at 2:29:something I believe. The new one was under 2 hour and 10 minutes.
The round is said to be about 80- 85 km long = about 50 - 53 (land) miles.
But a great achievement by J.C. and Kenny just the same.
Wouter