Durations are specified with positive integers and unit specifiers. Unit specifiers include the following.
An duration of 1 week is specified as 1w. A duration of 1 week, 1 day, 1 hour, 1 minute, and 1 second is specified as 1w1d1h1m1s.
The value -1 is reserved for unlimited durations. An unlimited duration is generally specified with the string unlimited.
Not all properties taking a duration allow all unit specifiers. For example, milliseconds are not allowed if durations smaller than one second are not permitted.
Some properties taking a duration also require minimum or maximum durations.