The answer to that question is £790m apparently, well that’s accordingly to
this article. A survey of 4,500 workers found that would spend around two hours and 18 minutes staring into space as a result of a hangover. That amounts to around £790m in lost productivity. The same survey carried out by Travelodge found that 30% of adults have called in sick because of a hangover, which they have passed off as another illness.