The water itself (hardness, mineral content), ambient temps and time between uses all are factors so there is no 1 answer. Typically you will know when it's time as the hot water will take on a sulfur smell like rotten eggs. A GOOD water filter, not the $19 in line type, will help mitigate the issue. Personally, I keep an 1 1/16" socket and ratchet handy in the back of the truck and pull the plug when it's going to be longer than 2 weeks before using again. YMMV
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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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