For how long can I store the batteries without using them?

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I know I should keep the batteries at 30-40% if I won't be using them for a while but for how long can I store them in this state without using them and without risking they will suffer from this in a bad way?

Reason I ask is I'm in Sweden and we have the winter season ahead of us when I won't be able to fly for several months.
 

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