There has always been debate about converting hours of use to miles equivalent. Obviously the rate of travel (ground speed) to the hours of use is not a direct ratio.
Some trucks will get more stationary idle time than others, some will be driven faster or slower than others etc.
Most of these trucks (where I work) in this class will be driven at 3 to 4 MPH on average. That is the range I like to use for "shoot from the hip" figuring.
That simplistic equation would yield an answer of around 90,000 to 120,000 miles equivalent.
Typically, the size of the general work space area and distance in which an operator has to work will have a direct effect on the average miles per hour factor one would use in the calculation. Operator personal need/desire for speed is another aspect to consider when trying to decide a hypothetical MPH.