Is it ok to turn off the fridge for a few hours for defrosting?
The US FDA says that an unopened fridge should keep food for about 4 hours before it starts to spoil. This time is reduced if the fridge wasn't already cold, or if warm food was recently placed into it and hasn't cooled down. It'll also be reduced if the seals or insulation on the fridge is bad. Not sure how much defrosting you'll get in 2 or 3 hours though...