How long can videos be added to a video on a YouTube channel if they are not copyrighted??

Question

YouTube

I didn’t find it anywhere, but some write about 9 seconds or 30 seconds.
The question itself: I want to make a video review (for example, from a movie or take part of a video from another channel, or an author's video from the news) and comment on it. What is the maximum time you can use from someone else's AUTHOR'S video from your comments and music, so that there is no warning or monetization is turned off?
If you know for sure and there is a desire to write in more detail (throw off a link with a detailed review), then I ask for more text.
Thank you so much (donate from me in the crypt, if this is not prohibited on this forum).

Answer 1

When presented, the copyright holder can upload a video/audio/photo of any size - it doesn't matter, a few seconds, even processed ones, are enough. The question is how will you process these requests. If you have a reasonable use, the strike will be removed. Although they can leave the video without monetization.
If you are doing news, reviews or training, then you can use copyrighted content to the extent of justified citation. This is according to the law of the Russian Federation. Actually, we were constantly unsubscribing to YouTube on the TV series review channel.
As a result of complaints, you can go into three states:
- Content will be partially blocked
- Content will be fully justified
- Content will not be limited, but monetization will be prohibited.
In the case of filing complaints - the 3rd option is the most frequent. But YouTube ads don't make that much money. Therefore, integrated advertising will still work. And we did not notice any impact on views. Here is a screenshot with all three videos.

And here are excerpts from the law of the Russian Federation, in which cases you can use someone else's content. But once again I repeat, we acted according to the law, but Fox, Warner Br - they constantly throw complaints. Almost every video where we inserted excerpts from their trailers.
quoting in the original and in translation for scientific, research, polemical, critical and informational purposes from lawfully published works in an amount justified by the purpose of quoting, including the reproduction of excerpts from newspaper and magazine articles in the form of press reviews;
the use of lawfully published works and excerpts from them as illustrations in publications, in radio and television programs, sound and video recordings of an educational nature to the extent justified by the goal;
reproduction in newspapers, broadcasting or cable communication to the public of articles lawfully published in newspapers or magazines on current economic, political, social and religious issues or broadcast works of the same nature in cases where such reproduction, broadcasting or cable communication was not specifically prohibited by the author;
reproduction in newspapers, broadcast or cable communication to the public of publicly delivered political speeches, appeals, reports and other similar works to the extent justified by the informational purpose. At the same time, the author retains the right to publish such works in collections;
reproduction or communication to the public in reviews of current events by means of photography, by broadcasting or communication to the public by cable of works that are seen or heard in the course of such events, to the extent justified by the informational purpose. At the same time, the author retains the right to publish such works in collections;
Reproduction of legally published works without profit in embossed font or other special methods for the blind, except for works specially created for such methods of reproduction.
2. Without the consent of the author and without payment of royalties, it is allowed to provide for temporary free use of libraries of copies of works legally introduced into civil circulation. At the same time, copies of works expressed in digital form, including copies of works provided in the order of mutual use of library resources, may be provided for temporary free use only in the premises of libraries, provided that it is impossible to create copies of these works in digital form.
3. The creation of a work in the genre of literary, musical or other parody or in the genre of caricature on the basis of another (original) legally published work and the use of this parody or caricature is allowed without the consent of the author or other owner of the exclusive right to the original work and without payment of remuneration to him.