How to log work time for a teaching job on Upwork

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If you have a teaching job on Upwork, how would you record the amount of time you work? My client and I plan to meet for class via Zoom. I read the Upwork work diary tracks mouse clicks and keystrokes in order to verify that you are working. But what if you are just talking to your student the whole time. Would the work diary record me as working even if I am not clicking anything? How should I record my work time?