Average Time on Page Calculation

Hello!

After extracting our Pendo usage data we are trying to figure out how can we match some calculations performed on Pendo, like the Average Time, located on Page Details. The calculation has the note User/Day, but we cannot seem to understand the calculation behind this value, because no matter how we try we cannot reach the same values. We have searched the documentation but it doesn't seem to explain this calculation. In order to debug this and understand if this might be a calculation or a data problem, could someone explain how is that value calculated?

Best regards