Take break after every 80 km and you are good to go. On Paper 260km looks a long distance but once you are on the road and synced with the machine its a very easy. Enjoy the road and the bike. All the very best.
Go for it man, i am sure u'll gonna be fine but pls make sure to ride safe.Take some breaks in between and ensure you have all the riding gears. Have been to Spiti valley on a solo trip and i just can't get over.