I'm a fairly beginning bowler, but like anything else in life practice quantity is outweighed by practice quality. This is good advice I learned from a guitar teacher while starting out. Be sure to identify something to work on and stick to it. Be sure this si something that needs work, too. If you are already good at something, it's fine to keep that tuned up, but focus on the parts of your game that aren't good or that you don't like practicing. For guitar, don't spend all of your practice time working on things you already are good at doing. Warm up and close with something that you can do well, but dive into the weaknesses. You can't fix everything at once, and people are inclined to drift towards what they are already good at. People like seeing immediate results. Another good example is golf. You see or know someone that can probably blast dozens and dozens of great long balls with their driver, but can't putt or chip or they have another big hole in their game. You see this guy at the range and he spends an hour with his driver and long clubs and 15 minutes on his short game. It's non-sensical. He's probably as good as he is going to get at hitting long balls, but he toils away to get only slightly better there while overlooking a huge hole or holes in his game. He never really reaches full potential. Anyway, just my $0.02 on practice time.
tl;dr
Use your time wisely. Focuse on one or two things in a session and work/focus on those. As for actual time per session, if you are to the point where you lose focus or physically start breaking down, it's time to pack it up. Bad practice leads to bad performance.
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