Board Thread:Game Discussion/@comment-157.193.89.84-20130805150055/@comment-12812688-20130806164544

It is over within 5 minutes. You know it's over because it's the 1st time you see the ability to enter in the code. When someone enters your code, it should show as 1 in your add section in the friends area, and you should get the 1st reward.

But yeah like LBB said, if they enter your code a few days later, or you are not the 1st code they enter, you will not get the reward.