A life built around useful work still needs time that is not another deliverable. You can choose rest without inventing a productivity claim to make it acceptable.
Start with the practical boundary. Which responsibilities genuinely need attention before you step away? Which can wait, and who needs to know when you will return? Address those questions without turning them into a condition that all work everywhere must be finished first.
Leave a credible handover
For a fictional weekend away from a project, save the current file, record the next action and tell collaborators your availability. Resolve any genuinely time-sensitive commitment through an appropriate arrangement. Then stop checking the project merely to reassure yourself that it still exists.
There will be situations where caring duties, employment conditions or other constraints limit choice. Acknowledge those circumstances honestly. A slogan about switching off does not change them.
Keep the purpose human
Choose what would make the time feel like a real change of attention: a conversation, a walk, an enjoyable activity or simply less demand. You do not need to measure whether the break made you more commercially valuable.
If you return to an unmanageable arrangement, review that arrangement. Rest can provide a pause; it cannot by itself repair a workload built on impossible promises. Give both the pause and the underlying problem their proper place.