A lot will depend on the quality of the water and the ambiant temps. Here in the DelMarVA area in July and August it can be in the 90's + in the daytime and not drop below 80 -85 at night. In those conditions I won't let it set over a week. In moderate temps 2 to 3 weeks. That's with decent weather.
It only takes a few min. And a little teflone tape so why put it off. Draining will also stop the sacrafical electrode from flaking away and settling in the bottom of the tank. When it gets "bad" you can get a sulfer smell from the hot water.
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Marshall
2012 Laredo 303 TG
2010 F250 LT Super Cab, long bed, 4X4, 6.4 Turbo Diesel
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