That depends on the make/model of fridge. The manufacturer will have supplied that information for each type of fridge they sell - however, the time given assumes you are NOT opening the door.
Different fridge makes/models come with different standards of insulation.
four hours
In the event of a power outage, food can remain frozen for several days in an unopened freezer. When the power returns, it is important to inspect the foods for spoilage before eating them.
A week or so?
A power outage is a short or long term loss of the electrical power in an area
Leave it closed as much as possible. It will keep the cold inside and help the food stay fresh longer.
Yes, margarine is OK after a power outage, it will only soften. Margarine is made from water and oil. Butter is made from milk and would not last long without refrigeration.
I believe 4 hours and 30 minutes.
Who knows? Is there an expiration date? If not, check their website (if they have one.)
Your electricity do not eat the food. It depends on how hungry you are.
About four days
6 -7 days.
About four days
Two to three days.