If it takes 10,000 hours to master anything. How many hobbies can an EE student develop

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I'm in my early 20s and I'm restarting uni again, however, I wasted most of my teens playing vidya, watching anime and porn.
I wanted to rekindle my interest in learning an instrument and foreign language at a conversational level under my belt.
However, I am afraid I might not get back to these interests when I have finally landed a wagecuck job or run a business as the effects of neuroplasticity are much more potent
when you're younger. How should a prodigious student schedule their time?