I had three exams in three days. Two were three hours and the other 1.5 hours. I ran out of time on two of the exams.
It's a very interesting (and rather unpleasant) experience doing exams at home. The reason I say its unpleasant is that I found there to be lots of distractions and I was getting frustrated at every little bit of noise (traffic, neighbours, sirens). Luckily, I live alone, as some of my friends have said that they couldn't cope with the noise from other people in the house.
All three exams were different formats. The first exam had two sections, one where you downloaded a PDF, wrote answers to the questions and photographed them and submitted; the other section was an online quiz. I struggled a bit with time management (since it was the first exam) and ended up spending too much time on the online quiz and not leaving enough for the written section.
The second exam was simply writing answers and drawing diagrams. Really no different to a normal exam, which I really liked. This was by far the best exam format, also it was my favourite subject. Time allocation was very generous, since it was designed for 90 minutes but we were given 3 hours.
The third was a PDF that you filled in boxes. I really didn't like this one, as we had to also upload photos of diagrams we drew and insert them (I don't have decent drawing software). I also found that the PDF would occasionally crash after inserting the photos. For me this was the worst exam, as I found that I accidentally filled in some of the boxes wrong and one of the questions really required printing out of the paper, which I couldn't do (three pages of spectra to interpret).
I've already received the marks for two of the subjects. They were quite generous with the marking (I got >90, even though I didn't finished one of them).
The academics put a fantastic amount of effort into the exam questions and the structures of the exams were well thought out (some formats were better than others). I just preferred the simple writing answers and photographing them, as it made it the simplest and most straightforward. If I were to do more exams at home, I would definitely get a printer.