Length

If you are unsure how long your synopsis should be, it is safe to aim for somewhere around 150 words. This is only a rough guideline; a short series or an OVA might not require as many words, while a series with a more complicated premise might require many more.

You should not feel pressured to pad the synopsis if it turns out to be short.

Ultimately it is the content that dictates the word count and not vice versa, so focus on making sure that you properly follow the instructions of the next section.