I live in a small suburb of Detroit, about 12 miles north of the border. I was in line 15 minutes before opening at 7:00 AM and was about the 25th in line. Once they opened it took 28 minutes until I walked out the door. It took my brother, in another city, 45 minutes once they opened.
When I left the line was wrapping around the building.
Spoke to a woman at work who lives in Detroit proper. She drove by the voting office at 5:15 AM on her way in and the line was already snaking around the building.