The FIND-DURATION function returns an integer in the form of complete units of the specified duration. Any rounding is done downwards. The calculation of durations includes microseconds.
The function type is integer.
Format >>-FUNCTION FIND-DURATION--(--argument-1--argument-2--argument-3--)-><
Argument-1 is subtracted from argument-2. The value returned is the number of complete units of argument-3. If argument-1 is later than argument-2, the result is negative. If argument-1 is earlier than argument-2, the result is positive.
PICOSECONDS 
PICOSECONDS duration can only be requested
when argument-1 and argument-2
are timestamp items. 