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I am running a study for my thesis, and would very much like to track the time it takes to complete a Google form to compare against how long it takes to fill.
A sneaky way would be to ask the respondent to enter a current time as the first question of your form and the actual submission time will act as the end time. Then you just run a simple ARRAYFORMULA in your spreadsheet to get the duration:
=ARRAYFORMULA(IF(LEN(A20:A), A20:A-B20:B, ))
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