As a rule, no, because the nature of the work we do is so variable. Take this simple example: Two people come to us asking us to create a brochure. The first person has all of the photo work on a CD along with the written body text. Person #2, however, needs to hire someone to take his or her photos and write the body copy. Quite clearly, the amount of time we are going to spend doing person #2's project is going to be longer. Furthermore, as we do not take photos ourselves, we are going to have to outsource that aspect of the project to someone else.
Our prices for everything we do is connected as closely as we can to how long it takes us to plan and complete a project, as well as any other additional services that may be needed or outsourced work.