I can suggest some ways of helping it cool faster. We are down to about 24 hours.
1. We plug it in a day in advance
2. We bought a battery powered small fan (Campingworld) that runs on 2 D cell batteries and moves the air around the refrig. Placed this on the bottom of the fridge blowing up.
3. I bought a computer fan (about 3" across) and two alligator clips. Cut the computer connector off the fan at the white plastic end and solder the alligator clips to the red and black wire.
4. Open the exterior fridge vent and place the fan so it blows up over the coils of the fridge. (I used four wood screws as legs and mounted them by screwing into the screw holes of the fan). Put a 6 volt lantern battery in the compartment with the fan and hook the alligator clips to the battery. Fan should only work when connected correctly.
These "helps" have helped the fridge cool a little faster. The only other way is to buy a lot of blue ice packs and freeze them in the house and load them into the fridge compartment to help cool all of the fridge down :<)