Hi Guys, First time posrt here. I'm considering starting a part-time landscape maintenance company. I'm thinking I'd buy a commerical 21" and keep my Harry-Homeowner mower as a backup. My questionis, how large a yard would you consider mowing w/ a 21"? Obviously I'm targeting smaller properties, but how small? Would 1/2 acre be too large? Also, any recommendations for a light-duty 21" commerical? I don't plan on leaving my day job. I'd just cut in evenings & weekends starting w/ 5 or 6 customers and hopefully working up to 12 to 15 good accounts. Thanks for any input.