I include 2 rounds of changes for every project. Each change beyond that is billed in 15 minute increments.
What is a “round” you ask? A round of changes is all of the changes you want me to do on the next iteration of your design. It could be as simple as showing you different colors or fonts. It could be adding or changing content.
What I consider a “round” is me opening a file, changing that file, saving it and then sending it back to you for review.