Board Thread:Question and Answer/@comment-60.52.5.233-20151011112221/@comment-7620285-20151011135837

the normal campaign map has been reduced to a place to get a couple area rewards, but most players find finishing the map helpful because you will get an item that expands inventory a bit. but it's true that nowadays there's so much to do in event maps that people barely have time to work on the Campaign Maps.

there's no limit but they have expiration times. they are sorted by which box will expire first.