Not sure how long it takes to really cool down the frig and freezer sections individually. Testing mine, I put two refreezable cold packs in the freezer part and a thermometer in the frig part and let it run overnight.
In the AM, the cold packs were froze hard as a rock and the frig was 33 degrees.
I had the temp indicator set near the top so lowered it a little. The indicator is that little white tipped wire that is attached to the cooling fins in the frig part.........but you probably know that.
Hope yours cooled OK for you overnight.
Have a wonderful holiday weekend.