I converted one of my machines back to a hand crank, as it had originally been and absolutely love using it.
And will be grateful to have it if/when the world really goes dark...
But as mentioned before, during a power outage we usually seek out fellow sufferers to talk about it
Four days was our longest during an ice storm in Portland Oregon in the 80's.
Our little wood stove was such a blessing. My neighbor make a giant pot of chili on day three on top of her woodstove...and put cinnamon instead of chili powder in it. That low light problem, oh dear! We ate it all up, anything warm was welcome.