We were without power for 7 hours. We ran an airstone for 15m every hour for the last 4 of those 7 hours. The APC battery backup that walmart managed the load for 2 tanks/airstones for those 4 hours. When load testing the APC we found that it would only run for 30 minutes when running a mag7. At the end of those 7 hours my fish were huffing pretty hard but they were all still alive.
I would think that if you could scoop and pour back water 15m every hour and make sure that you make a wave motion with your hand to move the water/circulate the air you're putting in that you'd be able to make it through for a while. Just make sure to move the water in addition to adding the O2
or it won't be as efficient.
Makes a generator sound good right about now, huh? We had one. Couldn't get it started (until the next day with the power on and the panick gone!!)
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Atlantic City, NJ September 25-27, 2009