I think that's a typo.
But let's check the math to be sure. 2 Drinks Per Day times 7 days per week..
clickety clickety ...multiplication factor applied to Friday-Sunday
clicket clickety ..."hanging out in the shop" margin for guest consumption ...2 more beers per day..
clickety clickety..press "Total"
zzzziiipppp! 4 cases. OK..so they were not far off after all.
"actute effects"? Is that the thing where you and all the wimmin around you get better and better looking - more cute - the more drinks you've had.?