Supposedly 50-72 cups a day.
Voltaire drank between 50 and 80 cups of coffee every day, usually at the Café de Procope, in Paris.
If your talking water, I drink around 6 glasses a day. Which is 250ml per drink.
I'm English and I love nothing more than a hot cuppa. We call them brews over here. We don't just have them with breakfast, most of us have it whenever we can. Tea is so widespread that at most work...
3 cups
That's up to you. There's no exact amount that you can or can't drink.