October 2016, 1093 miles in around 18h on a 2006 Honda ST 1300
No desire to repeat that, it was pretty miserable.
I combined this into a work trip, The direct route was about 700 miles and it went great, I based this "it went great" I decided to extend the trip home to get my saddle sore 1000 (iron butt). The trip up was my dry run / test trip.
The key factor that made the return trip worse was the weather. It rained for the first few hours, and was about 10°f cooler the combination of these had me uncomfortably cold for a large portion of the ride. I had a two piece gortex suit so I stayed dry but the overcast and temperature was just cool enough to really impact the trip.
I still have the bike, it has about 55k miles on it now and I try to commute on it whenever the weather permits!!
