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If your batteries are in reasonably decent condition
and you put them away fully charged, or as close as reasonably possible
and if you are storing cold ( I mean with everything OFF)
Then you can go longer than a month.
I do it all the time, i have disconnect switches on my battery posts (one house and one chassis). Sometimes I'll store for around 3 months or so with no problem
these lead acid batteries self discharge roughly 5% per month (very roughly)
and if you consider you don't want them to go below say 50% (seems to be the general rule of thumb), then in theory they could go nearly 10 months if completely disconnected.
Play it a good bit safer and say maybe something like 4-5 months and feel good about it...
I've learned all this the hard way from having to replace batteries in my boat and old popup camper after long storage intervals....
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