Hver stilling har et tidsrom som stillingen er gyldig i . Dette tidsrommet kalles varighet . Sommerstillinger kan for eksempel ha varighet fra 1. mai 2015 til 31. august 2015 .

Every position has a length of time that the position is effective . This length of time is referred to as duration . For example , summer positions might have duration of May 1 , 2015 until August 31 , 2015 .
