These are useful for computing specific time durations or for
converting from quantities in one unit to another unit
(e.g. time in milliseconds to time in nanoseconds for duration
formatting).
kNanosecond: One nanosecond;
kMicrosecond: One microsecond (1000 nanosecond);
kMillisecond: One millisecond (1000 microseconds);
kSecond: One second (1000 milliseconds);
kMinute: One minute (60 seconds);
kHour: One hour (60 minutes).
Examples
# To calculate 4 minute, 3 seconds and 14 microseconds:
4*kMinute + 3*kSecond + 14*kMicrosecond