I feel many people in tech and other office jobs have implicitly worked 4 day workweeks for years. During an average workday, how much time do you spend doing p

I feel many people in tech and other office jobs have implicitly worked 4 day workweeks for years. During an average workday, how much time do you spend doing personal things at your desk (texting friends, reading non work-related online articles, etc.)? I bet that time aggregated across Monday to Friday adds up to at least a full 8 hour day.