I spend a lot of my free time learning, not only work related, it's what makes me happy. I always found that spending my time on things I'm intrinsically interested in to be worthwhile. For example in 2003 or so I discovered this weird "Ruby" language, and for years people told me not to waste my time on it. Well guess what, it's 2018, I still use Ruby and it was a cornerstone of my career.
And if it's making you happy, keep doing it! Glad things worked out for you!
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