How much of a copyrighted work can I use under fair use?Created OnAugust 27, 2020Last Updated OnAugust 27, 2020byMotvio Print You are here: Main Fair Use How much of a copyrighted work can I use under fair use? < All Topics There are not a lot of clearly defined rules about fair use. Thus, there are no rules such as “you can use up to 30 seconds” of a video or musical recording. Tags: CopyrightFair UseFAQLegal Previous How is fair use determined? What are the “four factors”? Next What do the four fair use factors mean?