First of all, there are no such terms as the ‘ideal’ or ‘non-ideal’ length of a video since the length itself varies depending on several factors, such as the purpose of the video, its target audience, and the platform where it will be used. For social media platforms like Instagram or TikTok the most common length of a promo video is between 30 and 45 seconds. These platforms prioritize short and attention-grabbing content, so you need to keep the video brief and engaging there. For platforms like Youtube, the length of a video may range from 30 seconds to a few minutes depending on its purpose and target audience, as well as the complexity of the product being promoted.