No, you can exit during the course and come back later to finish. The only time you need to finish what you were doing, is when you've started a trial. Once you click the “Begin Trial” button then we’re scoring you on that trial, so if you click and then don't answer the question or identify the hazards (like by logging out) then you will fail the trial. So when you've hit 'Begin Trial', finish the question you're one, and then you can log out if you like.
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