Board Thread:FarmVille (game discussion)/@comment-6023015-20130119165353/@comment-3474542-20130303151624

There is a limit on both the amount of items you can claim per post, and how long each post lasts on the page before expiring. These limits change, depending on the mood of Zynga and Facebook, but it is generally between 1-5 items, and between 6-24 hours. If you click a post that has exceeded the limits, it will give you an error message.