I think a 4-day work week sounds perfect for anyone that is also focusing on side projects, and does not want to burn out when dealing with a 40-hour day job. Especially when that day job is not remote, and you are able to get your work done in much less time.
Personally I have not had the chance or courage to request a 4-day work week, but back when I worked remotely I definitely was able to use my flexibility to work when I was most productive to accomplish my tasks in less time, thus leaving me happier throughout the week.
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