Because ChatGPT’s knowledge is cut off October 2023, it doesn’t have updated information even itself and on exact prompt numbers.
You can refer to the following links for details on the message limits for the paid versions. However, there is insufficient information regarding the number of prompts for the free version.
https://help.openai.com/en/articles/9300383-using-gpts-on-our-free-tier-faq
https://help.openai.com/en/articles/6950777-what-is-chatgpt-plus
Also, you may visit following topic:
The free version allows only 3 file uploads daily, and after that, it notifies me that, based on my local time, I can return in 22 hours.
https://help.openai.com/en/articles/8555545-file-uploads-faq
