Say you get monetary judgement award in civil case and the losing party refuses to pay. You slap a lien on their house and 10 years later when they sell the house they are forced to pay it off to clear title before they can settle. Can you collect any interest due to the decade of waiting?
Depends on local law but, in general, yes. Judgment debts carry interest (often at a statutory rate, not necessarily the rate that the loan carried prior to judgment) and to clear off the judgment debt you have to pay that interest.
Yes, statutory interest on judgments in California is 10%
If the underlying debt earned interest before you put the lien on, it would continue to earn interest.