Are you talking about the BB dying?Since you know it's coming, I suggest you clean your filters before the outage. That'll prevent them from going bad too fast.
Funny I can't seem to remember or find where I posted my stock list. That's a good idea to prepare for longer just in caseI read your other post, tank is definitely heavily stocked, so it would be a good idea to buy battery powered air pumps. I believe walmart carries them. They're not too expensive so better to be safe about it, plus then you have them for the future. Also, if it were me I'd prepare for longer than 6 hours, just in case.
Are you talking about the BB dying?