Specify the desired length of the output
https://platform.openai.com/docs/guides/prompt-engineering/tactic-specify-the-desired-length-of-the-output
The targeted output length can be specified in terms of the count of words, sentences, paragraphs, bullet points, etc.
Note however that instructing the model to generate a specific number of words does not work with high precision.
例
about 50 words
in 2 paragraphs
in 3 bullet points
IMO:守ってくれないときもあるけど伝えるべきなのかー