I wouldn’t panic too much about that, I calculated some years ago that the loss of a cabinet’s worth, say 250 litres, of cold air from a fridge means you have to cool that volume of air down again, but it is only about the same as cooling 60ml of water from room to fridge temperature.
The contents have a much greater heat capacity than air, so reading the fridge, even for a couple of minutes, is unlikely to have any significant effect on the temperature of most of the contents.
Placing a room temperature 1 litre bottle of water/LL milk etc in the fridge is about the same as draining all the cold air out 16 times.
