What I did while I was at a 9-5 was work early in the morning and on weekends (I'm a morning person).
So basically Mo-Fr
5-5.30 Wakeup
6-8 AM Sideprojects
Then moveon with my other life and meet friends/sports etc. after work.
That gives you 2h/day or 10h/week on focused work plus some hours on the weekend.
I did not have a partner or family/kids, so it was pretty straight forward.
It took time to adjust to this and I knew it was only for a limited time before quitting my job, so it went for about a year (where I was not super strict with my times).
What I did while I was at a 9-5 was work early in the morning and on weekends (I'm a morning person).
So basically Mo-Fr
5-5.30 Wakeup
6-8 AM Sideprojects
Then moveon with my other life and meet friends/sports etc. after work.
That gives you 2h/day or 10h/week on focused work plus some hours on the weekend.
I did not have a partner or family/kids, so it was pretty straight forward.
It took time to adjust to this and I knew it was only for a limited time before quitting my job, so it went for about a year (where I was not super strict with my times).
I've tried this when I was still working 9-5 (more like 7-7 12-hour work).
Wakeup at 5am, get my coffee, no social media, just deep focus (learning to code, or work on my side-gigs) until 645am.
Then shower and get to work.
I rarely continue the side-of-things in the evening after work, too tired.