Its just over 5000 miles and according to MyRouteApp, 110 hours of riding. Only through Russia. And at 5 hours riding every day that’s 22 days each way, so possibly a 2 month, minimum trip. And probably one set of tyres like Mitas E-07s. Just thinking.
Excellent idea – just remember Russian Roads are incredibly busy full of artics and very few side roads to use. The combined service stations/hotels/restaurant & spare part shops are great.