20lb. tank, How long will it last fridge cont, 3 meals a day

Just wanted to let everyone know that I had no problems at all on our trip. We started using propane on a Thursday, and by the following Tuesday afternoon we were passing through Clayton New Mexico which has a place that will refill tanks so I decided to go ahead and fill it just to be safe. We had only used 1 gallon in that amount of time running the fridge, stove, and furnace one morning. And we didn't run out the following week.