Define Reasonable

In the CC&Rs, it says:
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Section 9.20 Sporting or Other Equipment: Temporary Use and Proper Storage.
Each Owner shall use the garage portion of his residence to store, or otherwise adequately screen from view of the street and other Units (as determined in the sole discretion of the Board of Directors) during periods of non-use, all portable sporting equipment and all other portable equipment. As used herein, periods of non-use shall constitute any period of time in which the equipment in question is not used for a reasonable period. In any event, all equipment mustbe stored overnight.
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Comment here as to what you think a "reasonable period" would be.
Thanks