response time
US /rɪˈspɑːns taɪm/
UK /rɪˈspɑːns taɪm/

1.
the time taken for a person or system to react to a given stimulus or input
:
•
The new software has an improved response time.
•
Emergency services aim for a quick response time.
the time taken for a person or system to react to a given stimulus or input