How often does the gas bottle for hot water need changing?

Pilot light normally left on.

new bombona 26/11/2014 (butane)
new bombona 17/12/2014 (propane)
new bombona 8/1/2015 (propane)
new bombona 31/1/2015 (propane)
new bombona 24/2/2015 (butane)

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