reaction time
noun /riˈækʃn taɪm/
  /riˈækʃn taɪm/
[countable, uncountable]- the amount of time it takes for a person or system to respond to something
- With slower reaction times, drivers are less able to take action in response to sudden hazards.
 - Reaction time is typically slowed after concussion.
 - Touch screen reaction time can be a little sluggish.