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How long does a 20lb propane tank last?

Inquiry:  

I also had a question regarding the burner itself but generally how long does a 20lb tank of propane last while using the burner continuously?

Outdoorstirfry: 

We are user of the stove ourselves for last 20 years.   A 20lb propane tank usually lasts 3~4 months.   My wife cooks 1~2 dishes a day on the stove.   We have 2 tanks, a full tank sitting ready to swap in case the 1st one runs out in the middle of cooking.