Hazard-function estimates are utilized to analyze the effect of numerous public policy variables on strike duration, based on 7,546 strikes in Canada between 1967 and 1985. We find that only the mandatory strike vote substantially reduced conditional duration. However, the policy variables generally had a more favorable effect on reducing strike incidence, so that on net they tended to reduce unconditional duration (incidence times conditional duration). Specifically, reduced unconditional duration was associated with the existence of conciliation and the requirement of a mandatory strike vote, but the prohibition on replacement workers had a perverse effect.