I do all of my yards bi weekly. If i do a yard Tuesday evening after work, I make sure I do it in exactly two weeks on Tuesday. The reasons for this are I don't want to miss the money by skipping a day here or there which will add up by the end of the season. Plus, if I wait a few extra days it makes for more weed eating, more difficult edging and more blowing. If rain is in the forecast I will show up a day early if possible and then another day or even more sooner if needed within the two weeks after a rain depending on how tall the grass is. The more opportunities to mow, the more paychecks. You work hard for your money. Don't let the customer make you work harder.