How long does a 9kg propane tank last on average when cooking with Arc Lite? 13 February 2026 14:37 9kg/20lb Propane Tank should last for around 35 hours on full heat. Related articles What assembly is required? What fuel is used with Arc Lite? How much cooking space does Arc Lite have? What is Arc Lite's recovery time between cooks? What should I do when first firing up the Arc?