The longest ride I have ever done in a 24 hour period was just shy of 1100 miles. It was on a naked Yamaha XS1100 Special and is documented with the Iron Butt Association. I have run hours at a time on I-40 in Tennessee at 95MPH on my Cagiva Gran Canyon. This was on a roadtrip that covered over 2500 miles last Fall. I didn't say that a windscreen has no effect. But all that bullshit boy racer plastic bodywork around your engine makes you look like a wannabe.