That's how long it's been since our water heater thermostat decided to break. We could manually light the pilot, but it would go out after it finished heating the tank. Over time, this time period became shorter and shorter, and the resulting hot water would be less and less.
Our house and it's appliances are only about four and a half years old, but it was such a cheap-ass water heater to begin with, and our water in SE Indy is so hard and mineral-laden, it killed it before it's time.
This weekend, we finally shelled out $600 and change for a new Sears water heater. 50 gal, full recovery in less than an hour, 12 year warranty. The guy was in and out in less than an hour. Saturday night, I took a so-hot-it-hurts bath, at the same time Kat ran the dishwasher and washed the pots and pans in the sink.
The nice thing is, by waiting until after winter and only lighting the old heater when we needed it, we kept our natural gas bills very low. I don't think it ever got above $40 a month. Now with the new uber-efficient heater (238 therms/year, 1.6 on a scale of 1 to 10), we should be able to keep them low during the summer.
Time to go buy some Mr. Bubble.