I think the length of security early warning video can be adjusted according to different needs and situations, but generally speaking, it is recommended to control the video length between 1-5 minutes. First of all, the main purpose of safety early warning video is to convey safety information to the audience and remind them of safety problems and dangerous situations. Secondly, shorter videos are usually more likely to attract the attention and interest of the audience, and it is easier for them to remember the important content in the video. Of course, the length of the security warning video also depends on its content and theme. In order to ensure the effectiveness of the safety warning video, it is suggested to control its length between 1-5 minutes.