Nuns do NOT spend every free minute praying, nor should anyone that is reasonable expect them to.
Nuns are human beings, just like the rest of us.
When I was in a Monastery, we played games during recreation. Had video games been available, I have no doubt we would have played ones that were not offensive or irreligious. I can tell you, some of our games got pretty competitive (ping pong, chess, baseball, basketball, etc.)
Even contemplatives have actual recreation time. The body, and the soul, need recreation for optimal health.