If one man starts with the trimmer, then there will be no standing around. You will not be able to get a good cut at full speed, at least not during the spring. Even still you should be able to do this job with two men in less than two hours. For one man, it would take about 3 hours (depending on the man). The only thing that would concern me is the 10 day cycle. That will be a problem through the spring, and you may need to double cut it to get a good cut. Cut this at 4" and keep your blades clean and sharp. 130 - 140, is competitive. You might find as many of us have that working with your friends sounds like a great idea, but really turns out to be a horrible idea.