Due to some policy changes beyond my control, i will have to provide maintenence as well as fertilization on several accounts this season. 36 years in lawn care, 0 years in maintenence! Should i price the mowing based on square footage or by the hour? Iwill be mowing with a kubota B3030, rear pto finish mower, model & size yet to be determined. Thankx for feedback in advance, Scott.