Never give a price by the hour. People will go crazy if the hear $60 to rake leaves.
Does not matter that you use all kinds of power equipment their not going to pay a lawn jocky $60 an hour is their mind set.
This is why you tell then a price for the job.
Also depending two same sized props, one can have a lot of leaves then other no where near.
Figure out what you want to charge. Then be prepared to lose your shirt on it because you did not realize how much work was involved.