An open afternoon can look like a scheduling error.
Surely there is something you could get done. Groceries. The appointment you haven’t made. A few emails that would make Monday easier. You could meet a friend, provided you also return the package on the way.
There are good reasons for these choices. A household does not run on intentions, and work rarely tidies itself away. The trouble is how quickly every available hour acquires a job.
Even rest can arrive with instructions. Take the walk. Track the sleep. Finish the book about why you need to slow down.
It is possible to become very efficient at preparing to enjoy your life.
An unhurried afternoon asks for something less familiar: deciding what to do without first establishing its usefulness.
Perhaps you stay at lunch. Perhaps you go home and read. You might walk somewhere without combining it with an errand. Nothing especially remarkable needs to happen.
The difficulty may be arranging the time in the first place. Someone else might need to take over. A task might wait. You may need to tell a person who depends on you when you will be available again.
That is real work, and a pleasant sentence about rest does not remove it.
But once you have made the arrangements, try leaving the time alone. Resist turning the afternoon into a test of whether you know how to relax. You do not need to feel peaceful from the first minute or return with a useful realization.
You might simply enjoy yourself.
Later, when someone asks what you did, the answer can be very short.