Well I managed 650 miles from Denmark to Brugge on a Honda C90, my advice would be do a lot less than that
I'd kind of agree with consensus here that 250-350 miles a day will be a nice mileage, sustainable day on day, I'd be wary of Lorries and so forth trying to maintain momentum and forcing you into the hard shoulder when they pull in after an enthusiastic misjudged overtake and the fact you'll get stuck behind some of the slower movers without the oomph to get past safely
Part of me would like to repeat my Mongolia journey by something smaller like a wr250r, though I got great economy from the 990 at those speeds 52mpg average, by contrast my C90 got only 60-70mpg on the Autobahn.
If it was me, and I was concentrating my finances and time outside of Europe (taking the back roads across Europe could be fun, but taking the slow route costs £££) I'd tow/van my bike out to Chelm/Poland (I've driven that in 24hrs eating just my pack lunch from home) and head into the Ukraine on two wheels
Don't know if that is an option for you or not though, just throwing it out there....have fun
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