Originally Posted by
eponymous_coward
Well, I am sort of meaning "Do I have to call back in every 3 days to mess with the itinerary I have so far to keep it alive, or can I just tell US that I'll book the other parts of my itinerary when T-330 becomes valid?"
You must call every three days should you want to play the game of re-booking an itinerary repeatedly.
At the stated expiration time, your itinerary expires.