Ok this guy I went to give an estimate to, wanted to have his yard aerated, but I told him all I have is a tow behind one, and it's obvious it won't work on his yard. It's about 3/4 of an acre. If I was to rent a walk behind aerator how long would it take and how much does a walk behind self propelled aerator cost to rent on average?....I know all rental places are different, but they were all closed this evening when I was doing the estimate. This yard is mostly flat, a couple of areas with some hill. Thanks for any input!