Facebook has set a video length limit of 4 hours on its platform to ensure user experience and data transmission efficiency. This limitation applies to videos up to 16:9 aspect ratio and maximum width of 1280px, with recommended resolutions up to Full HD (1080p). Longer videos may not be eligible for auto-play or have reduced auto-play percentages due to prioritization of user experience. These restrictions aim to optimize video content and data consumption within platform parameters.