This article is for the users who have an account role with the “Supervisor” level of access to Care (that is, for Account Admins and the users who have a custom account role with the “Supervisor” permission in Care; see Account Roles).
When you mark a case as done, the case enters a grace period during which it is considered closed. If a customer posts a new message (comment, wall post) during the grace period, the case automatically reopens. For more information, see Manage Community Escalations with Care.
By default, the grace period is five days. You can adjust the length of this period based on your business requirements.
Go to Settings -> Care -> Workflows.
In the Close cases after… section, adjust the length of the grace period as you need.
The new length of the grace period is saved.