MICROSECONDS_IN_MILLISECOND = 1000
MICROSECONDS_IN_SECOND = 1000 * MICROSECONDS_IN_MILLISECOND
MICROSECONDS_IN_MINUTE = 60 * MICROSECONDS_IN_SECOND
MICROSECONDS_IN_HOUR = 60 * MICROSECONDS_IN_MINUTE
MICROSECONDS_IN_DAY = 24 * MICROSECONDS_IN_HOUR
MICOSECONDS_IN_WEEK = 7 * MICROSECONDS_IN_DAY
