I hate that text:
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* Invalid period/count. TOTAL (period * count) duration must be less than 1 month, and more than 1 day.
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As written in the almighty Wikipedia, the average month in the Gregorian calendar has a length of 30.4167 days in non-leap and 30.5 days in a leap year. Not just 4 * 1 week. I'd like to place an item for 5 * 6 days in the rentals, yet it isn't possible. I even waive for the rest. (0.4167 days!!!) ;-)