title: Naming: time you have to wait before something is valid
body: <p>We are tracking offline conversions in google adwords and have to wait 4-6 hours after the click before a conversion can be attached to it.</p>
  
  <p>I have a constant that references this time and it is currently called <code>CLICK_GESTATION_HOURS</code>, which is kind of a play on the standard life-cycle terms such as 'expiry'.</p>
  
  <p>It got me wondering, is there a standard computing term for the time you have to wait before something is valid?</p>