To have the ability to use a window of time for set up and pick up of radon equipment. Example: Set up scheduled for Monday, March 2nd between 10am and noon. This would allow more flexibility when adding more radon appointments and not lock into a specific time. So if a radon set up has been scheduled for a time between 10am and noon already and an order has come into set up another radon the same window can be used and allow the sequence of set up and pick up of equipment to change with the business needs, demand and employee availability.