My aquarium pump broke two days ago. How long can the fish go without him?

I have a Rena 300. It is 3 years old and has left blowing bubbles. It is not putting enough air anymore. I did some research and I have to get the replacement kit for the valve block and the diaphragm. Unfortunately, broke in the middle of the night and the pet store was not open, and then I forgot that today is Sunday and the pet store and aquarium store closed early (the employee aquarium shop told me very suddenly on the phone when I called to check its Sunday hours had to get home to see the Superbowl). Anyway, the fish can survive for another day (it's been two already) without air pump?

Yes! And the other comments are correct … basically, the bubbles Air pump does not put oxygen directly into the water. What happens is that when the bubbles burst on the surface to allow oxygen from the air to the mix in the dissolved water in small amounts to break the surface tension. The filter in the tank does the same when the water moves around … Your fishes will be A-OK! : P

Repairing The Rena Air Series Air Pumps