[quote name='Lozz196' timestamp='1486319592' post='3230871']
As you mention Youtube, why not get a list of songs you want to learn, and then play along. I do this and although the songs themselves may not stretch my abilities, learning more new songs in my opinion makes me a better bassist for the type of music that I do. I also pick up some tips on good runs, patterns etc this way, so I guess it must be improvement. I`d really knock a 3-4 hour practice on the head though, I think all but the most dedicated would be likely to run out of steam after a couple of hours.
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I used to spend 14 hours some days. Better to plan on 4 and end up with 2, than plan on 2 and end up with 1, in my opinion of course.