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Level 5

Two things to take into consideration

Exit pages have a visit breakdown scope, meaning they persist across all hits for a visit. When you use that dimension it is not considering just the last time the page value was set.

Second, from the documentation:

"In the case of props, time spent is counted across subsequent link events as well.""

This means that the last page of my visit may still have time added (lets say I watch a video on that page with tracked interactions, this would allow for a hit to use in the subtraction).