I was known to go ambling the corridors when I needed to get away from the screen for a bit.
And more annoyingly, I was knocking my knuckles on the walls, my colleagues asked me to stop because the noise would disturb them.
When a project is one year late, a 5 minutes break will not change much.
And when a project has been well timed, the 5 minutes breaks should have been taken into account.