Creating a segment using a calculated metric for Average Time Spent on Site
I would like to segment out the number of visitors who spent more than 20% of the average time on site during the month.
For example, the average time on site for June was 3.53 minutes (or 3:32) and we had 65,000 visitors. Of those 65,000 visitors, how many of them spent 0.71 minutes (or :43) OR MORE on the site (which is 20% of the average)?
I created a calculated metric (see attached), but I don't think I'm doing it correctly. So first I need help figuring out the correct calculated metric.
Once the calculated metric is created, how do I create a segment using that calculated metric? I don't see it as an option with the tools I have available.
FYI, I only have access to Reports & Analytics (not Ad Hoc Analysis or Report Builder). I appreciate your help!