Adobe Analytics isn't able to calculate time spent in situations where that page is the last hit that occurs during a visit, although we are able to determine that someone had visited the page. That's likely where the difference in the 156 and the 224 is coming from (i.e. visits where that page is t...

Would anyone be open to having a conversation about the specifics of how they would like to see this work? We are revisiting this and I'd like to better understand how this would ideally work for you.