I have never scalped a yard before. I have a customer that wants her yard scalped. I will be doing this with a toro 21 push. Her weekly price is $60 and it takes an hour to mow, edge, and blow. How long do you guys think it may take? Is $180 a good price, or will i get burned at that? She has already told me its a hard job. What height should i cut at 3/4"or 1 1/4"?