5 days if no advance warning. You are allowed to post the win as soon as the game says “5 days” but we encourage you not too do that right away. Add a comment in the game and PM him here, wait a couple days and then post the win. Its optional, but the sporting thing to do, particularly if the game is equal or you are losing.
@technomagez – Yes, as long as you dont forget. @Hansol00c, ask in a post on Robot’s forums, they have more active strategy discussions and many League members post there. In general though, the answer is control the bonus tile(s).