I've cut my own yard ( which is about 1/2 acre ) many times, but using my riding mower mostly; which takes usually around 90 minutes to do front and back. But I was planning on going into biz this year and need to know how long to expect it should take me to do 1/4 acre homes as I already know several people who would like this service from me. So the actual square footage of grass is less than 1/4 acre as the houses are fairly large and take up at least 25% of that space. My gear to start will be merely a self propelled 21", a gas trimmer, and gas blower. One guy has estimated 30 minutes. Is this right or would it be better to figure 40-45m. I have no way to test this unless I go to a friends house and do a pretend cut...lol...which of course would be innacurate and a bit ridiculous anyway. And while I'm at it, how about 1/6th acre homes? Would that be about 1/2 the time of a .25? THanks to anyone who would be nice enough to give me some good input on this!