Khan Academy Unit Test - Are they timed? And if I get disconnected from the Internet are they saved?

So, I'm finishing up Lesson 2 of Trigonometry and I took the Unit Test today. It is 12 questions. On about question #10 I think I hit the wrong button on my PC somewhere and I never could get back to my test to finish it. I still don't know how I lost the page but I think it stinks that you can't get back to resume the test...UNLESS....they are timed tests. Then that's perfectly fair and understandable that there is no resume option if, in my case, time just simply ran out.

However, I'm pretty sure that these tests are NOT timed because I would have more than likely been watching it constantly for fear of running out of time. So, I ask this question more as a confirmation than anything else. 

But I got a score of 50% out of 12 questions which means either 1) I got 6 answers wrong or 2) the remaining answers I never got to finish were counted wrong automatically and that sucks too.

So, unless these tests are timed (and maybe that could be left up to the student to decide if they want to challenge themselves, which I do) I want the ability to resume my Unit Test and finish answering all the questions without being punished with a crappy score.

Thanks for reading!!!