When you allow others to access your Outlook calendar, they may be able to add appointments or view the times that you are available for meetings. To prevent people from scheduling you for work or inviting you to meetings during times that you are not working, you have two options: change your work hours, which allows other to see when you are free or busy, or add a recurring appointment to your calendar, blocking others from scheduling you during those periods. Warnings Writer Bio

How to Block Non Working Hours in Outlook Calendar - 11