It is possible to make an average without storing all individual durations: https://stackoverflow.com/questions/30003040/method-to-calculate-the-average-without-storing-individual-values
Perhaps it could be used to store the average duration, creating the possibility of estimating time saved.
It is possible to make an average without storing all individual durations: https://stackoverflow.com/questions/30003040/method-to-calculate-the-average-without-storing-individual-values
Perhaps it could be used to store the average duration, creating the possibility of estimating time saved.