my landlord filed bankruptcy in 2011. the trustee put the house on the market. how long can we stay?

You can stay until you are evicted.  You can try to reach an agreement with the new owners once it's sold, assuming they do not want to occupy the property.  Otherwise, they will bring an unlawful detainer action against you to have you evicted.  That process usually takes a few weeks, but is dependent solely on state law, so you should check with a landlord/tenant attorney on that. Mark Markus has been practicing exclusively bankruptcy law in California since 1991.  He is a Certified Specialist in Bankruptcy Law by the State Bar of California Board of Legal Specialization,  AV-Rated by martindale.com, and A+ rated by the Better Business Bureau.