Your work schedule has flexibility built within it. Schedules are agreed upon with the client assigned to you. Take into consideration their time-zone when setting the 2-hour daily window schedule that you will be available for immediate work.
Outside the 2-hour daily schedule, all tasks that are tagged as not urgent can be done during your own time within the day.
Any adjustments to the schedule shall be requested by the client at least 24 hours in advance.