The length of the video podcast depends on its purpose. Of the many types of podcasts available, video podcasts have many distinct advantages over audio podcasts. For example, if you are selling a product, a video podcast can be great to demonstrate your product. If you are more interested in advertising your business, a video podcast can be a great way to promote your company. It primarily has to do with what you want to achieve with your podcast. A video podcast should be at least 10 to 15 minutes long as a rule of thumb.