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I would also love this to be added. I'm a submariner, which means that I'm underwater, without internet, for months at a time. Simply "downloading more stations" doesn't work because of how much overlap there would be with different stations in the same genre. So in the like 5 genres I listen to, each station only downloads like 3 hours of music each. That's only a realistic 15 hours of songs that I will be listening to for several months.
For me, storage would not be a concern and music would be something I would prioritize for my storage. so having 24 hours of music per station would be AMAZING for my situation.
I wouldn't imagine this feature also shouldn't be terribly hard to implement. Just add a setting that changes whatever variable determines how much music to download for a station.
You can download your own playlists up to 5000 songs each. One easy playlist to get much more play time than the "stations" is to download your thumbs up playlist.