I got like 56. I haven't done one of those in a long time. I will usually mess up a lot because I start thinking about it too much. I can really type a lot faster when I am just typing from my head.
My best was 73, but I kept mistyping and thus spelling words incorrectly. It's not unusual for me to mistype words if I'm going half that fast, and I usually pause between words to give my fingers a breather, so this whole endurance run typing that quickly for a consecutive minute is certainly not something I can do naturally.