I have been using sites like zillow.com to give people estimates without having to drive to their house. Well, I get a call yesterday and I check the site and it says the lot is 8k. So minus the house, patio and driveway Im looking at about 6k. I bid $30 since I think it would take 30 minutes max. Well I get hired and go to mow it today. The lot is more like 17k after I subtract everthing. So it takes almost 3 times the amount of time I thought. Now I have to explain why my price is skyrocketing. More than likely I will lose him.