From a UK Bureau of Labor and Stats study, the average office worker is only productive for ~3 hours/day. People spend the majority of their time surfing the internet, socializing, eating/drinking, and looking for a new job. I wonder if it's worse in east asian countries where no one leaves before the boss.

Source: https://www.vouchercloud.com/blog/office-worker-productivity...

The last time I worked in an office, I got most of my work done in the morning or after 6pm when no one was in the office.