I have a Msc in Architecture and I switched to software engineering after two years of working as an architect because I simply 1) love programming and 2) do not like working as an architect.
Meanwhile I also started running, hiking, doing yoga and short meditations, as well as cooking at home and voloneering for homeless people in a civic initiative. I also learned french and italian language and learned how to knit and crochet. And just recently I joined the bookfairies comunity in books hiding and spreading the magic of book reading :)
In my opinion (and experience) you can have as many interests and hobbies as you want, but you have to be aware that time is limited and sometimes you have to pause/delay one activity to commit to other.. And if you really need/want to excell at one of them, maybe it is better to invest a significant portion of your time in it.
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