I started a RJS Sauvignon Blanc kit (no skins) 20 days ago on 2/25. Had to leave town unexpectedly. All that is in the fermenter bucket is Bentonite, juice, water, and yeast. The fermenter is covered and has an airlock, so I figure I have a CO2 cap sitting on top with no oxygen threatening the batch. Not sure when I can get back to town to move to a carboy. How long can I leave the batch on the yeast without damaging the batch?