It means personal preference for work, not personal activities.
If it just meant "34 he work weeks" they would have called it that.
Does "inventing the post-it note" sounds like a personal non-3M-business-related project?
https://www.3m.com/3M/en_US/careers-us/working-at-3m/life-wi...
https://www.fastcompany.com/1663137/how-3m-gave-everyone-day...
[citation needed]
Otherwise, a "personal project" is a project I own.
[citation needed]
Otherwise, a "personal project" is a project I own.