I have found and understand the documentation around how Average Time on Site is calculated, however I'm still puzzled by some of the numbers I'm seeing in one of my Workspace dashboards.
Typically I keep Average Time on Site nested in a table with individual pages as a dimension, but recently I needed to find a number for this across an entire quarter for the entire site, as well as each month within that quarter. In a new report, I set the quarter in question as the timeframe, and created a new table with just Average Time on Site and used "All Visits" as my dimension. This gave me a total average of around 7 whole minutes. Fishy.
Next, I replaced "All Visits" with "Month" and for each month I see an average closer to 1 minute, which seems more realistic.
I feel firmly that the 1 minute averages are probably closer to the truth, but before I report these numbers can anyone help me understand why the average gets so bloated using the "All Visits" selection as a dimension? Thanks!