I work for at least 9 hours from Monday to Friday, including a non optional 1 hour break at lunchtime (which wildly differs among coworkers in the same timezone, creating 2-hour communication blackouts). Out of those 9 hours, I code for 2 to 4 hours on a productive day. I spend the rest of my workday in meetings, reading tech literature, and browsing codebases.

When I'm working on a personal project, I can do actual coding for more than 5 hours a day. The difference is huge.