How many minutes of cooking time from lb propane tank with 4 burners on high?

The cooking time you can get from a 1 lb propane tank with four burners on high depends on the BTU rating of your burners. Typically, a standard propane burner uses about 10,000 to 15,000 BTUs per hour. Since a 1 lb propane tank holds approximately 21,600 BTUs, you could expect about 1.5 to 2 hours of cooking time with all four burners on high, translating to roughly 90 to 120 minutes. However, actual cooking time may vary based on burner efficiency and usage.