ChatGPT handles up to 4096 tokens in one input, any characters beyond that will be ignored without displaying a message. As a general guideline, prompts should be no longer than one or two sentences, and the language should be clear, simple, and easy to understand. This will ensure that the prompts are effective in engaging users and keeping the conversation flowing. This is because users tend to have shorter attention spans when it comes to chatbots, so shorter prompts are more likely to keep them engaged and responsive.