It may be pulling its maximum rated power while it comes up to temperature, but it'll be regulated by some sort of thermostat.
Once it's at temperature the rate of heat dissipation of the hob, pan, and even the ingredients themselves will affect how soon it'll drop below the threshold and power draw will resume.
A system with a lower maximum power would still work, but it would be running at a higher duty cycle to maintain the same temperature. It would take longer to get to the set temperature in the first place and slower to bring it back to temperature whenever the temperature drops.
That said, I'm pretty confident that 700-800 watts would be useful for many types of cooking and I think it's achievable with a dozen or so people pedaling.
Insanely impressive effort by a maximally trained professional, and he's definitely toasted.
This is like a cartoon technology — the general concept is right, but the scale is just waay off...
Anyway, worth the look
https://www.youtube.com/watch?v=S4O5voOCqAQ
https://www.popularmechanics.com/science/energy/a15889/bike-...
> A hot plate typically draws 1000 to 1400 watts.
> A Tour de France cyclist typically generates 300 to 350 watts. Joe Average on a bicycle will go over 150 watts only in short bursts.
> (And remember: muscles generate heat, too - and they're only 18-25% efficient. So the power peddler will be heating up, but won't have the cyclist's breeze cooling their body down... )
> -- lurch, Jun 07 2015