How does the message limit work?

I'm awear of the message limit and the 70 message every two hours, but I'm not sure how exactly it works? I usually don't run out of messages however, when I do and wait two hours or more and come back, I can only send like 3 messages before I've reached the limit? Like just last night around 2 am (don't judge) I reached the message limit so I just went to bed, I didn't use the app until 4 pm today and I was only able to send four messages before I ran out. Am I missing something here?

Ps. Plz be nice, I'm fairly new to Charecter Ai and still learning how it works.

EDIT/UPDATE: Thank you to the nice people who helped me out to understand what was really going on. No need to comment "there is no message limit" anymore thanks 🙃