we dont have time to pick up many more properties so we bid high in hopes we dont get them but if we do they are good paying jobs. i would definetly charge double for biweekly. harder on mower, harder on blades, likely will need to clean out after and if you dont double cut it will look like **** and reflect badly on you. i have been there before and had a customer want biweekly when we are in full grow season and i had to tell him it reflected badly on me if his business looked so bad. he told me that if i wanted to cut his grass that i would do it when he said. i replied with it looks like i dont cut your grass anymore then. thank you..