Gas bottles

This will sound like a real dumb question.
I've got a 4.5kg gas bottle, I don't use it much. if I was using it everyday for cooking, how long will the bottle last.
I usually only use it to boil the kettle.

cheers
Cliff

At a guess I would say 3-4 weeks perhaps more. depends on what BTU's your burner is using.

BTU's ?? now ya got me.  I dunno, it's just a poxy little primus 2 burner but the box says 10,000 BTU output.
Think I'll have to do some googling to see if there's a calculator for gas usage.  The bottle still feels pretty full after the last trip I did, I think I might be right for another week or it'll be cold tinned baked beans and stew  

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BTU's most camping stoves are between 7500 and 1200 BTU's. More than enough to boil water. More important that you have a windsheild so that your not wasting heat/flame. If you weigh the bottle it will give up an indication as to how much gas is left. By the sounds of it you have more than enough gas for a week. Unless you plan on smelting gold, lol.