Makes sure that you don't spend too much time playing Hearthstone, using Hearthstone Deck Tracker's technology.
You can create custom "time constraints" with it, which, whenever you have reached the certain limit for that day, will flash up a message reminding you that it might be time for you to get off Hearthstone and do something productive instead.
Wherever you have Hearthstone Deck Tracker installed, drop the HDTimeManager.dll (available in the releases folder) into the 'Plugins' folder. Then run Hearthstone Deck Tracker and enable this plugin in the plugins menu, and ta-da! If the plugin does not show up in that list, right click the '[PLUGINNAME].dll', go into Properties and click "Unblock" at the bottom.