You can ferment sauerkraut too long, at which point it will become mushy, and the taste will be too acidic, even though the sauerkraut will still be edible. Longer ferments will intensify the flavors and tangy taste of the sauerkraut. The length of your ferment is usually according to your personal taste. The traditional ferment for sauerkraut is about four weeks, but some people prefer a 3-day ferment.
It is definitely possible to survive on rice and beans alone, since the meal is considered to be a complete protein, providing all 9 amino acids that are essential to life. The carbohydrate value of rice provides a good source of energy. Rice and beans partnered together will make a survival food that can sustain you indefinitely if you can stand the boredom!