I just finished casting my vote. The two major issues I encountered were:
1) There was not enough space to write in my write-in votes. The rules on the ballet said I needed to write the name and address of my write-in candidate. The box was small and they only provided a large felt tipped marker. I'm quite sure it was not possible to write in a vote following the rules with the writing instrument they provided.
2) Five minutes is not nearly enough time to finish the ballet (luckily they didn't kick me out as the law allowed). The guys on both sides of me also took over five minutes.