Re: A certain bias, there
Correct, kind of. But that 8 hours assumes you drank all 4 pints at once.
units of alcohol is about strength % * volume (in litres)
So a metric pint (half litre) of 4% beer is 2 units.
If you begin at at fairly normal 20:00, drink 4 pints between then and 00:00, that's already 2 of the pints gone from the system, the next 2 by 02:00. Driving to work the next day at 08:00 won't be an issue.
(This is a rough estimate as it takes some time for your liver to start processing the alcohol obv.)
In the UK, the drink driving limit, roughly, for a 12 stone man, is around 4 units, so you would unlikely be over the limit if you waited an hour or so after midnight and then drove (but I wouldn't recommend risking it).