Did you know that there are two rule settings in Quest Mode? It's up to you to pick either "Defeat Leader" (which is the default) or "Defeat All." The latter will yield more items, whereas "Defeat Leader" will get you higher quality (but fewer items) if you're fast enough. So pick "Defeat Leader" if you're confident that you'll be able to take down the leader in seven turns or less. If you're out to get a large number of items and take a longer time to finish battles, then "Defeat All" is the choice for you.