2.2.32 [RFC5545] Section 3.3.6, Duration

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V0041:

The specification describes the DURATION data type.

Microsoft Office Outlook 2007, Microsoft Outlook 2010, Microsoft Outlook 2013, Microsoft Outlook 2016, Microsoft Outlook 2019  

On import, Outlook attempts to approximate the value of invalid DURATION values. If it cannot approximate the value, then it ignores the property.