StopWatch is built upon the free and open source FlipClock.js plugin. This stack itself is provided for free download. A bare-minimum of settings make this stack quick to deploy. It's ideally suited for use in conjunction with stacks like TimeRelease, AdvancedPublisher or Expiry; with the intention that you would put StopWatch inside one of these three stacks, together with other content. That way when the expiry date / time is surpassed, the entire block container is hidden.