How long will a 40Pound LP Tank run a 36000 BTU gas log set?

A 40-pound LP tank typically holds around 9.5 gallons of propane and has a heating value of 91,502 BTU/gallon. With a 36,000 BTU gas log set, you can estimate that the tank will last approximately 2-3 weeks if the log set is running continuously. However, actual usage time will vary based on factors such as the efficiency of the gas log set and how often it is used.