I sat one exam at uni (in person, invigilated) for History and Philosophy of Science, which had no time-limit. You could take as long as you needed, whether th

I sat one exam at uni (in person, invigilated) for History and Philosophy of Science, which had no time-limit. You could take as long as you needed, whether that was one hour, five hours or all day. Pretty much everyone still took three hours. But you felt so much calmer, knowing you weren't racing against the clock.