I am looking at a condominium complex - 28 units with 3.25 acres of turf. About 1/3 of the turf is in the front yards and will need to be done with a 21" and the back and common areas can be done with my 36". I figure about 45 minutes to trim and 4 hours to mow - solo. I am figuring on a bid of $320. Do my times sound reasonable or am I way off? I am also bidding for the applications and bed maintenance on this property.