When trying to crown a word in Monkey Ball, I know you have to do all the levels without a continue but does it have to be in one sitting?

I was working on the 5th world over multiple sessions (complete a few levels, exit and came back later to do more) and after I finished the boss, I got the Congrats screen saying it had been crowned but when it showed the list of worlds again, it wasn't crowned. Quit and went back in, same. I then went through the entire level in one sitting, got the same crowning congrats message and now it shows as being crowned. So I'm assuming it has to be done all in one sitting, correct?