Regarding energy/water use:

ChatGPT uses 3 Wh. This is enough energy to: [...] Play a gaming console for 1 minute.

If you want to prompt ChatGPT 40 times, you can just stop your shower 1 second early. If you normally take a 5 minute shower, set a timer for 299 seconds instead, and you’ll have saved enough water to justify 40 ChatGPT prompts.

(Source: https://andymasley.substack.com/p/a-cheat-sheet-for-conversations-about)