I have been told it will take 2 men 2 weeks to do....
You're a brave man if you take someone else's estimate as gospel. It could be wrong by a couple of hundred percent either way. I wouldn't dream of accepting a job on those terms.
As to price, I would have thought that was easy: 4 hrs a day driving is 20 hrs a week so 40 hours for the two weeks at your usual rate times 2 because it's 2 men's work so 80 hours before you even start

Then four man-weeks: whatever you would expect to earn if you were working locally per week times 4.
Are you sure you still want this job?