How do you calculate response time for a single day?
It’s a bit tricky to calculate email response time for a single day, because many emails are not responded to until the next day, or several days later. So, we calculate average response time for a single day as the average amount of time it takes to respond to an email received on that day.
You received exactly one email on April 1st at 10:00am and later responded to it on April 3rd at exactly 10:00am. Your email response time for April 1st is 48 hours; the time it took you to eventually respond to the email you received on April 1st.
In other words, your average email response time for April 1st the average of all your responses that you eventually sent (on any day on or after April 1st) for emails you received on April 1st.
As such, your average response time for any single day in the past can and will change as you reply to emails received more than 24 hours ago.
Similarly, in the above example, you would not see your email show up in April 3rd’s average response time drill-down. Your response would show up in the response time drill-down for April 1st.