
Once you determine ideal video length, you’re ready to start drafting your script. We recommend aiming for the following word counts:
15-second video: 30–40 words
30-second video: 75–85 words
60-second video: 140–150 words
90-second video: 215–225 words
2-minute video: 290–300 words
For More Info http://videomarketing.somedia.net/how-to-find-the-ideal-script-length-for-your-marketing-video-content/