Saturday night 1 had 2 bottles of wine and 4 bacardi and cokes and a glass of champagne, from 7pm and finishing at midnight.
I reckon thats about 25 units.
10am sunday I blew a breath tester before driving home (one of the Halfords ones for driving in France, well in date) and it came up completely clear*. Given that Frances limit is less than ours, I reckon that I was gfood to go.
So starting from 9.30 (halfway through drinking) to 10am say 12 hours I processed about 2 units per hour.
Thats my science for the day.
*Note recent press over the accuracy of these things, but it was in date and I followed the instructions.