This is a great resource to have on a clipboard near the computers and/or other technology available to students in your classroom. I generally give 5 minutes when someone is waiting. And the student who is turning over their computer or technology kindly lets the next person on the list know that they may have their turn.
It is a great management tool to also track who is using items available and who is not...
I also generally state that AR and Research can bump free time users as dead