In the Fixed lead time column you can enter a fixed lead time in whole workdays on operations in an order. One day of fixed lead time means that the start and finish will be on the same day, two days of fixed lead time means that start and finish will be on the days after each other. Dynamic lead time calculation is performed if this column is empty.
This column appears only if you have activated the setting Use fixed lead time for operations? under Preparation under the Manufacturing tab in the Settings procedure.