since when does it take 15 min to complete a test

The unit test for energy was a bit of a doozy. Since our schedule for the day was messed up, we were only given 28 minutes to complete the test. Seems impossible, right? It actually wasn't as bad as I thought it was going to be. There were only 20 questions, and I managed to finish with a couple minutes to spare. We got our grades back and I managed to score what I needed to keep my grade where it needs to be in order to exempt the final exam.