I thinks 40-50 km/day will not be possible, u should plan for max 20 km/day and on high altitude may be less. after 3-4 days u will be tired and will definitely will take rest. I don't know whether u guys are following "kamran on Bike" on facebook, he is travelling across america from south to north on a bicycle, even he does not cover 1000 miles in 20 -25 days on a bike.
I think u should plan ur trip properly i think it will not take less than 60 days to cover this distance.
I don't want to hurt u but plan keeping the facts in mind.