"duration" - key terms from Wikipedia

average duration
bond duration
covers a duration
duration
duration and intensity
duration gap
duration of action
duration of copyright
duration of study
duration of the stimulus
duration of the war
effective duration
extended duration orbiter
long duration
maximum duration
minutes in duration
mission duration
modified duration
pulse duration
short duration
sleep duration
symbol duration time
total duration
tracks and covers a duration
valve opening duration