http://snippets.bentasker.i2p/posts/flux/calculating-the-total-time-spent-in-a-state.html
However, this counter resets when the state changes, so the duration column only tells you how long each instance of the state lasted and because the counter is added to each row, you cannot simply sum() it to calculate the total time spent in that state (say a switch being on) However, it's possible to calculate the total amount of time spent in a state using the elapsed() function with a...