I try to work on side-projects weekends afternoon, and during the week I work on the evening for few hours when I want it, so most of the time 2-3 days during working days.
What helped a lot is making sure the task of my side projects are easy to reach and last less than 2 hours, this way I can see progress even with small loads of work.
For the working days, working on side-projects helps making the cut after a day : I finish my jobs at time, take a one hour break, eat something, and then go back to my side-project.
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