UR to me due diligence and contingency periods are independent events. A contingency period is an amount of time you have that starts at acceptance and ends at some point after acceptance. A due diligence process is a process you the buyer goes through to find out information about a home you want to buy. A due diligence process does not need have a necessary start time or even an end time for that matter. Obviously it is bounded in some manner by the contingency period and your liability as a buyer increases substantially (ie the cost of the home in the case of a trustee sale) by not completing due diligence prior to contingency periods ending.

Abstract it out. You can perform due diligence anytime if you like, even BEFORE the purchase of a home which is strongly advised in a case of a trustee sale.

Yes as far as I know trustee sales are all cash. I believe my post stated contingency = 0 for trustee sales, and I was trying to imply that the due diligence process may be started early (prior to the auction) for trustee sales by trying to knock on the door to get in.