I drain mine when I winterize. Much may depend on the quality of your water source, and how often you use it. If I had odors with the water then I might drain it after use. But since the question is "how long can I", then it can be left in until winterization.
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Jeff and Dana McCreary
2004 F-250 SuperCrew Lariat 6.0 Diesel
2003 Cardinal 312 BH
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