How many design revisions should be included in a wrap design fee?

Two included rounds is the working standard, with a round defined as one consolidated list of changes on the chosen concept. Beyond that, bill hourly ($75/hour is common) or $75-$150 per additional round — and once the file prints, changes are a new order, not a revision. How to structure it: overlam.com/blog/handle-design-revisions-without-losing-money.