I'm planning a tour from Europe to Asia too.

My plan is to start in France in May, head down to Spain, then explore some more of Europe, heading zig zaggy eastward. I'm thinking I'll spend 6-7 weeks total prior to crossing into the Ukraine along the northerly route (through Russia and the "stans").

My daily average is about 100K/day, as I do like to stop and explore/relax.