This is an Ace3 addon using LibDataBroker (I display it with Bazooka, that keeps track of the instance IDs saved against your characters. Getting confused about which of your toons is saved to which instance is a thing of the past! The addon keeps track of all the instances you've ever been saved to, and can function like a todo-list if you like. If you'd like to see the instance IDs or the time left until they are reset, hover the mouse over the Normal or Heroic indicator for that instance...
Monitor the remaining duration on your Mysterious Eggs and other perishable items. These items (and their durations) will be hardcoded in as they are requested. Items are only properly detected when you first receive them. Item detection is disabled when the Trade window is open, in order to prevent detecting old items. This is an Ace3 addon, with support for LibDataBroker. A minimap icon is available for those without a broker display. You can find the official forum thread here. You can...