There never used to be a time limit. It was then turned into 60 days.
Casino offers up until very recently had to be selected within 7 days and that was just changed to 30...two entirely different things.
At least some of the itineraries are set to be released soon. Just saw a test load for Navigator Feb 14, 2025 out of LAX appear. Haven't looked at others
Other than during the Pandemic price drops after final payment have not been allowed, nothing new. Why do you think they should change just for you. That would open it for everyone.