You must finish a round of walking between the student's desks within 5 minutes.

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3. Moving around the classroom
... Continued from the previous blog.

3) You must finish a round of walking between the student's desks within 5 minutes.

Probably, It's might be the most important aspect. I mean the speed of walking around would be fast.
The "within 5 min." is the basic criteria. It would be better that you did within 3 min if you could.
If you stayed and talked for a long time at a specific student's desk, you couldn't walk around within 5 min. The longest stay at a student could be less than 30 seconds.