Currently the PDL allows for duration expressions of the type <quantity>

<unit>, e.g. 5 business hours or 5 days. Please expand this to allow the word "and" between multiple nodes. The time should be aggregated as milliseconds. Some examples,
5 business days and 2 hours,
1 month and 25 days and 2 minutes

Tom's suggestion is that if business appears anywhere in the string that the entire duration is considered to be in "business time".