The short answer is not a very complete answer. It depends. I understood your question to be - how long does it take to edit a video (or film). There are challenges presented by the complexity of the video as well as how much video you have been given. For example, say the the output of your video is 30 minutes, live action. This might be something like a long form interview between two people. As a video editor, you may get up to 100 minutes of content (or more). Editing includes determining what is included and what is removed from the source material that you have been given.
Hope this can help you.
Hope this helps!