Precisely. You could decide, for instance, to take some time off after your days are up. During that time you wouldnt be able to log in. Then when you get the urge to play again, you could add a card to get 30 more days and log on right away. I know you didnt ask about this, but it also would add those new 30 days to your veteran status so you still get closer to the various reward tiers(veteran status is just cumulative, it doesnt need to be consecutive). Everything regarding your character just kinda waits for you to come back if your account lapses. Your quest journal and inventory remain the same. Your retainers keep holding whatever they have(and even keep trying to sell things for a certain amount of days after you last log out) and waiting for you to come back and issue new orders. So you can pick up right where you left off.