Time - (Duration|Elapsed Time)
1 - About
Duration or elapsed time is the difference between two timestamps.
Duration may be negative due to:
- leap second for instance if your process goes in millisecond
- change in the OS clock if your function doesn't return a monotic time.
When using a non-monotonic clock source is to always check whether the elapsed time is negative.
Called also: Time - Wall Clock ??
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