Enphase connector protective caps

I read that the enphase AC connectors must be capped with enphase caps when not connected to the 240V bus for extended time. How long is extended? Can I leave the AC connectors unconnected for a week? Two weeks? Should I go buy a couple sets of protective caps if the system will be un-connected for three weeks?
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|| Midnight Classic 200 | 10, Evergreen 200w in a 160VOC array ||
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Same thing goes for the DC connections to the inverter, although in the case of newer IQ models at least there is a replacement part for those.