What do teachers usually do to kill time when they are on invigilation duty

[Murali]

I am writing this while supervising an exam and I am totally bored, feeling sleepy, and my legs are aching. What can I do to pass time quickly without using my phone too much

[Arjun]

some teachers snack, gossip with their colleagues, walk around the room a bit, or go to the restroom to quickly check their phone