So you need to write a killer video script? Let me show you how. First things first: keep it short and sweet. As a general rule, people can only speak a maximum of three words per second, which only gives you 90 words for a 30-second video. You don’t need to write complete sentences, but practice reading your script out loud so that it sounds natural. Keep each script to one message and think about how to get your customer’s attention in those crucial first moments of your video.