I can just sense how far it's from reaching my limit, and my sense is quite accurate. I can also sense when a conversation is about to reach its own maximum length, so I use the last resource to generate a summary so that I can start a new conversation and resume progress. Ironically, these AI tools have become part of my biological clock. Besides Claude, every Wednesday is like a new kind of Sunday for me, because my ChatGPT's weekly limit is reset on Wednesdays.