What are Flexible Start Times?
You can choose between Fixed Start Times and Flexible Start Times. Fixed Start Times are the default type post for one specified start time.
Flexible Start Times allows you to select an acceptable range of times that a Task can be started (between X o'clock and Y o'clock).
How do I create a Flexible Start Time Task?
Whenever you create a Task, you will see the Fixed/Flexible Start Time as an option. You must enter the Earliest and Latest acceptable Task start times.