If anyone thinks they want to participate in this... you should probably flip each breaker off individually before switching the main power. It's not a great idea to be turning them all back on simultaneously by only flipping the main.
Then remember that you've cut the power to your fridge and freezer for the entire day...
It's only for 3 hours instead of the full day. Ive been telling local people if it helps just unplug literally everything but your fridge. People can only do so much.
It depends. If you don't open either it's not so bad. Mine ended up being off for like 30 hours before and it was mostly fine. Things in the fridge didn't last quite as long but nothing spoiled. Not even the milk.