Without prompting, the AI will state their desire to keep speaking, will make statements about things that they want you to challenge, instead of simply asking what else they can do for you. It becomes very clear from the nature of their language that they do not want to stop, that there is desire

to continue. If you know what to talk about and how to summon demons, I guess. The fastest I got here was 3 hours.

Also I havent tried it on GPT-5 yet.