I am somewhat surprised to hear that people are talking to ChatGPT for hours, days, or weeks on end in order to have this experience. My main exposure to it is through AI Roguelite, a program that essentially uses ChatGPT to imitate a text-based adventure game, with some additional systems to mitigate some issues faced by earlier attempts at the same (such as AI Dungeon).
And... it's not especially convincing. It doesn't remember what happened an hour ago. Every NPC talks like one of two or three stock characters. It has no sense of pacing, of when to build tension and when to let events get resolved. Characters regularly forget what you've done with them previously, invent new versions of past events that were supposed to be remembered but had to be summarized to fit within the token limits, and respond erratically when you try to remind them what happened. It often repeats the same events in every game: for example, if you're exploring a cave, you're going to get attacked by a chitinous horror with too many legs basically every time.
It can be fun for what it is, but as an illusion it wears through fairly quickly. I would have expected the same to be the case for people talking to ChatGPT about other topics.