Interresponse time (IRT) is the measure of time that occurs between two consecutive instances of a response class, which is a basic measurement for many behaviors targeted for reduction or acquisition.
How do you calculate IRT?
https://www.youtube.com/watch?v=wjj66jItSpY
What is IRT in continuous measurement?
IRT, or interresponse time, is the time in between two responses. More importantly, two response in the same response class. If your client takes 20 seconds in between bites of food, the IRT is 20 seconds. If you go 5 hours in between meals, the IRT is 5 hours.