Go through the link Understanding the "Time Spent on the Site" Metrics - Digital Marketing and Analytics by Anil Batra to understand the gap in Average Time Spent on Site.
But Infinity/Invalid should not show up in the metric until otherwise the implementation/calculated metric is wrong.
Can you share the screen grab from Work space and your public URL to help?
I have the same problem: For Average Time Spent on Site (seconds) and Average Time on Site the result is infinity. Other metrics related to Time Spent e.g. Time Spent per Visit (seconds) work. In addition, the two metcirs work in other created reports in WORKSPACE. Does it depend on the timebreack? is there an explantion for that?
Thanks for any help!
Thanks Arun for your help!