I know its too early but i am lining up people to find out if they want this service. I have a person that comes to the Rest. and asks me if i would do there lawn. (aerate). Its almost 4 acres. I normaly just take what i charge for the lawn and times it by 3. seems to work well. anyway, if normaly its 45 bucks an acre to cut. does 540 bucks sound about right? And i have never done a large prop like this. 1/2 acre tops. about how long would it take to do with a say 36ish w/b unit?