Question

Let’s say we’re tracking the times when a user is performing a certain action, and we want to know the average time between said actions.

For example, if the user performed this action at these times:

• today, 1 PM
• today, 3 PM
• today, 6 PM

The result would be 2.5 hours.

I actually have solved this already, but I felt my solution was more complicated than necessary. I’ll post it as an answer.

Answer 1

It seems that you are basically looking for Max – Min divided by Count.

    public TimeSpan? Average
    {
        get
        {
            var diff = _dateTimes.Max().Subtract(_dateTimes.Min());
            var avgTs = TimeSpan.FromMilliseconds(diff.TotalMilliseconds / (_dateTimes.Count() - 1));
            return avgTs;
        }
    }

Make sure you check that there is more than one DateTime.

Update: Even more accurate if you use Ticks.

TimeSpan.FromTicks(diff.Ticks / (_dateTimes.Count() - 1));