That's quite interesting "up to 1 bottle each night". They would probably be referring to wine at around 12% and being a bottle, 750ml - that's 9 units. I drink a little more, like 15% ABV and 1,000ml which is 15 units, well that's not a little more it's 1.67 times more. That 1L at 15% ABV is the same as five pints of beer at 5% ABV.
I have drank so many nights in a row now I have lost count, it must be about 50 days probably, having between 800ml and 1200ml each night. Gotta watch it!