looking for hours needed. all the same size (1700 sq ft) front yard is 1/3 back is 2/3. flat, no trees, no trimming, no load/unload time, all in a 3 mile radius (i will just drive mower around). will be using 60" z (whichever brand will be fastest, maybe a dixie chopper?) On paper it looks like i could get them done in about 22 hours (solo)....seem possible?