I'm having some work done in my basement, including breaking up part of the concrete slab to run new plumbing. When my contractor claimed they had been "at it for hours", I popped open my sense app and looked for anything odd. There was a characteristic large-wattage draw that, interestingly, looked just like an electric jackhammer going up and down.
I told him: It looks like you started about 2:30 and ran the jackhammer about 4 times for roughly 5 minutes each. That doesn't sound like "at it for hours" to me. The contractor asked. "What have you been doing, spying on me?" I said, "No, when it's in your own home, it's called 'domestic surveillance'."