I don't think it's possible, but I wouldn't mind trying again.
I was shooting for the Guinness Century Club at the Common Share a few years ago when they had it and made 100 Guinness in about a week and a half. The most I could do in any given night was around 14-15 over the course of like 7-8 hours, but the next night the numbers were drastically reduced (4-5). I suggest taking a day off from drinking as well.
However, even if you don't drink 47 a day, I still maintain that Guinness is good for you. I'm seldom sick and I haven't met too many people who drink more Guinness than I do.