We don't limit you on how detailed your drawings should be but please note a 1 minute video should be approximately 150-170 words with a maximum of 15 scenes. For example, you already have a video script of 300 words. There is a way to compute the length for your video. Simply divide your script's word count by 150 (average word count per minute). So in this case, 300 divided by 150 is equal to 2, which means your video is going to be about 2 minute long. So keeping this guideline in your mind, you will have a fair idea about how detailed your drawings should be.