Some interesting statistics:

The maximum sustained energy one can burn daily is 2.5 times the basal metabolic rate BMR, which is how many calories you burn when doing nothing.

On average that’s 4000 calories/day.

That’s the equivalent of:

Running a clothes dryer for about 3 hours

Running a vacuum cleaner for about 3 hours

Running a desktop computer for about 10 hours

Running a refrigerator for about 10 hours

Running a dishwasher for about 2 hours

Running an oven at 350°F for about 2 hours

Driving a car for about 100 miles

Burning a candle for about 140 hours

Burning coal in an oven for about 2 hours

Running an air conditioner for about 6 hours

https://www.science.org/doi/10.1126/sciadv.aaw0341

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Discussion

Now I am really tempted to try that out :) My maximum on a day was approximately 1200 calories and certainly far from my limit, my BMR is 1600, so 4000 calories is surely doable once :) Non ultramarathoners can even do non sustainable 5 * BMR, that would be 8000 calories. I did once 4 days of hard dry fasting without a lot of movement, so burned maybe 7000 calories in that time period, but 8000 calories (assuming BMR and food intake chancel each other out) in one day through exercise sounds way, way harder :)