If you noticed that in Codex you no longer a see a 5-hour usage limit, that's not a bug.

Users of Codex may have noticed the removal of a 5-hour usage limit. This change is not a bug, but an intentional update. The previous restriction on usage time has been lifted, indicating a potential shift in how the platform manages user access and engagement. This development suggests a more open or flexible approach to user interaction with Codex.