Because :

in 2004 "Orange II" 120ft Cat with Bruno Peyron, FRA, did 706.2nm in 24 hours that is an average speed of 29.42kts

And that is a SUSTAINED speed for 24 hours. The peaks were over 30 knots for sure.

Source : http://www.sailspeedrecords.com/distancerun.html

Wouter

Wouter Hijink
Formula 16 NED 243 (one-off; homebuild)
The Netherlands