If you're asking that seriously, then the answer is that it largely depends. The GPU, the render engine, the FPS, the quality (HD, FHD, UHD, etc.), the lighting setup, all that and more can increase or decrease the render time. There are shortcuts you can use if you have a long enough loop - i.e., if the loop is the same animation for a certain period of time, then you can just render the first second or two worth of the frames and copy-paste them - but that only works if you don't have a lot of variation in a high-action scene. Most people find it more enjoyable to watch videos where the animator goes out of their way to add tiny deviations in the looped action, so stuff like slight shifts in the angle of a thrust or thrusts that are deeper or shallower than the rest of the action. Facial animations and accurate lip movement. Cumshots at the end, and fluid simulation takes up a lot, too. Camera panning and dynamic camera angles.
TL;DR? It's about the rig, the render engine, the complexity of the animation, and the quality of the video. Whenever you increase the latter two, render time goes up.
