[juvvel]

I'm really really skeptical about the professional growth you can achieve during mostly unguided ~2 hours a week. Might be enough to read some articles, but not enough to build any marketable skills. ETA: I know very few people who find it enjoyable or sustainable to account for every single minute in their day, humans also need rest and downtime to continue to function.

[Zetice]

Why unguided? And why does learning require losing rest and downtime or having to "account for every single minute" of your day?

I'm not sure where you're getting those things, these aren't "either/or" suggestions, but "both/and".