Generally revisions are done in groups, or as a list, and the further through the project we get, the shorter and shorter the lists get. The amount of time the revisions will take depends on what they are, but unless it is an unusually long or complicated list it should not take more than a week. Usually it takes a few days.
Once the revision hours included in your project have been used up, any additional revisions would be billed at our hourly rate, $55/hour for design work and $65/hour for programming work. We can put up content for you (which falls under the design category), adjust slideshows, make site improvements, or even start a new project for you if you want to add something big like a mobile site or an eCommerce system.