Once you are all signed up to participate, you are officially ready to receive notification of a campaign’s live release. The live release can drop at any time and everyone gets notified at once, so make sure you have your phone or email handy if you want to score one of the top rewards. All you have to do is click on the link you receive.
Most sign-up periods last 4-10 days. Most rewards are claimed in less than 30 minutes.