(24 hours * 60 minutes/hour * 60 second/min) = 86400 seconds
86400 seconds / 10000 swings = 8.64 seconds per swing, non-stop without sleep
Reducing that to a normalized 2 seconds per swing, that's 6 hours a day non-stop.
Some cursory research indicates a sword strike carries
140 Joules of energy.
Double that, since air-swings have to started and stopped by hand. One more again, to reset sword to top.
Meaning 4,200 kiloJoules of energy used. 1 kcalth = 4184 J.
So ~1000kcal (nearly half the food consumption of an adult a day) increase.
Without even considering any inefficiency or waste in biological intake and conversion.
Such as in ATP conversion, or sarcomere (muscle fiber) protein activation. Which hardly is efficient.
And this is completely ignoring anything else, like basal metabolic rate or sleeping.
Or the fact "sword swings" don't practice skill; they don't make one a swordfighter.
Reminds me of that one "pressed a button a for a million years" novel -- just making up numbers.
I'll stick to
Yajin Tensei for my more well-topically researched Isekai martial art stories.
