I really don't know. There are what, 2-3 units per pint? Yesterday was a very relaxed day in terms of drinking - rather casual indeed, and that was three strongish pints at the first pub (so lets say six), two cocktails at a cocktail bar (so...maybe make that 10), and half a crate at someone's flat, so ....17.5 in a day, and that is hardly unusual. Definitely ~50 a week I guess That is excluding nights out, which add a disgusting amount on to the total i would assume.