How do you simmer broth for 72 hours?

[Guest guest]

Hi everyone,

I'm making some pork broth/lard right now but I wish I could let it simmer for

longer than 12

hours. I have a gas stove so I wouldn't want to go to sleep with it on.

How does anyone simmer something for that long? Am I missing something? Could

I turn it

off and leave in in room temperature overnight and then put on the stove again

when I wake

up? Or should I cool the broth, put it in the fridge overnight and then

continue boiling it the

following day?