Hello @JulianMurphy ...
Sorry to read about the issues you were having with your test in your course. You've posted your question in the global Canvas Community website ... which is completely different than submitting a ticket to the Canvas Help Desk staff. Posting your question here does not generate a ticket of any kind. That being said, based on your posting, your instructor is the one who has configured the time settings for your test. You should ultimately get in contact with your instructor about the test. But, I wanted to also give you some written documentation geared towards students for quizzes:
If you still have questions, you can also contact the Canvas Help Desk staff ... and they may be able to look at the settings that your instructor has configured for the test you have taken. How do I get help with Canvas as a student?
Good luck to you!