oh good, was gonna say.. u basically $^*&! out of luck when the power goes out for that long but if it happens again as a very crude disaster-control option you can take the cubes out of the dwc tray spray a large zip lock bag on all sides with the water/nute mix you using and wrap it around the root zone up to the top of the cube with a rubber band to make a semi seal.. I did this once with some clones when my pump siezed on me and had to wait 3 days while a new one was shipped and they survived ok (still had to spray once a day at least though) - also reducing light levels during this time will allow them to survive for longer until a perm solution presents itself..