Has anyone calculated the amount of oil wasted by smartphone engine idlers?

I constantly see people sitting in their cars with faces lit by glowing screens, squandering finite-at-any-price oil, not caring about climate change or anything but their phones and other self-centered distractions. They do it in all kinds of weather, so heat or A/C is a limited excuse.
Update: https://www.google.com/search?&q=engine+idling+waste+CO2

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