Hours in Period

This field is used in the dilution factor calculations.  It represents the number of standard hours in the dilution period.  

By default, this value is populated from the "Work Hours" as defined on the Time Period Setup screen, but it can be overridden by using the edit icon.

You may want to manipulate this value if, for example, you had a user that did not work the entire period and thus you could like to adjust the basis hours for the dilution calculations.