Pruning 60 Knockout roses

I have a client for whom I do landscape maintenance. I have always billed by the hour. So each time my charge may be different based on time.

this will be the first time that I prune her 60 knockout roses. I will have to dispose of the cuttings as well. How would you bid this? Your usual hourly rate? Or would you go more because of the PITB factor?

Because this will take more time than I usually take, I will give her an estimate ahead of time rather than just working and telling her how...

Pruning 60 Knockout roses