Most i have done is 675 miles on the SV. Set off at 7 in morning and got to destination at 9 in evening. Had a few rest stops (chunnel tunnel being one) and had perfect blue skies, sun behind us as it went down and perfect temp. Never have had the chance to repeat it though but planning to next year
Bike rode perfectly and i must had no problem with comfort. My build/weight is probably the exact type the bike was made for.