Star Wars: Episode III – Revenge of the Sith (what most people mean by “Star Wars 3”) has a runtime of about 2 hours 20 minutes (140 minutes) for the standard theatrical version.

Some sources and fans round this to around 2 hours 20–26 minutes , but the commonly listed official runtime is 140 minutes.

So if you’re planning a watch, set aside a bit over two hours for Star Wars 3.