You can leave it in standby mode for the whole month it has battery life (you should load it though halveway through it).
Putting it in 'Off'-Mode might e contra productive because the kindle isn't designed to eb shut off but to go out without a shutdown sequence.
It has a linux-system underneath it and holding the off-button for a long time (around 15seconds) will let it go out like a PC plugged from the power cable.
It could be ok to let it shutdown by pressing the off-switch for ~7seconds but I'm not sure of this.
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