I did one today that was 15,000 sq. ft., i used my bluebird 530a.. what a workout.. lol. $100 bucks, took 1.5 hours to go over it one time.. pretty wide open, not to bad on hills. i felt like i could have gotten more, and i was dreading the job, but i felt like it wasn't as bad as i thought it would be. I did a little 6k square foot lawn for $90.00 last week, it was farther than i wanted to go and they agreed on my price, so it was a nice little job. Although, I seem to avg. $75.00 for a small lawn 3k to 5k. I hate to aerate, i see guys all around offering it for $40.00 bucks, screw that. Thats probably why I only get 2 or 3 a summer. don't matter, i hate aerating.