The productivity is based on whether they are getting paid per unit production or time and materials. In earthworks jobs trucks hauling set the rate of production mostly. Example the excavator fills a truck to the legal weight of 20 tons close to 10 m3 of material in 2 minutes, but 30 trucks aren't going to be filled in that hour.
If trucks aren't a concern the dozer/excavator can do a lot of square meters at 5 to 10 km/hr grading with a grade control/survey guy.