Magic numbers are any number in your code that does not immediately become apparent without being immersed in context.
Bad
Function GetsTheInterval(Duration)
Return Duration < 10 * 60 * 60;
End Function
Good
Function GetsTheInterval (Duration in Seconds)
MinutesHour = 60;
SecondsMinute = 60;
SecondsHour = SecondsMinute * MinutesHour;
HoursIninterval = 10;
Return Duration < HoursWininterval * SecondsHour;
End Function