i took the april 7th mcat (8am test). i got there at 6:50 am, and was the first one there. I got to start at 7:20 am, and finished about 12:30pm.
i highly recommend getting there early. if not, while you're doing verbal, others are already on their writing section... and it can be very hard to concentrate when all you can hear is typing noises 🙂