This is a delicate issue. You must consider the importance of your future goals. At the same time, you must know when your current practice level is adequate. When you feel the need to improve, it is time to take some time to practice, not to be rushed.
The best approach is to practice on a regular basis, using a piece that you can perform at any time. It is usually better to practice while practicing a classical piece than it is to practice while rehearsing in a rock or jazz concert. Even so, you should keep in mind that you might not always have the time to practice and therefore you should consider your next practice session very carefully!
How often should I practice?
This is a highly personal question that depends on your goals and the way in which you choose to practice. Some people like to practice as often as possible. Those who have a strong memory could do it on a daily basis but that is the least efficient way to learn a subject as there is no guarantee you will remember it by the time you finish.
On the other hand, a lot of people who are less interested in learning may find that they really enjoy learning only when their practice time is limited. This may be one of the advantages of practicing with music that you are not as passionate about as a sport. But even if you find yourself enjoying only a few minutes of your practice, you should still be very serious when going at that pace.
The good news is that there are many times when you can take a few minutes and just jam on violin. The trick here is that you have to pick a piece when you have a good feel for it. You could play this piece just once and be done, but this will still only get you started. Pick another piece, this time with a very good feel for it. If you are confident that you will have a good feeling for that piece, pick a different piece every other day and do that for a few days.
Practice one piece at a time and, in the meantime, try something else; you’ll learn more as you go and you will improve as a musician as a result.
Do I need to practice more?
If you are only practicing with pieces that you have already practiced at least a couple of times, then you probably don’t need to practice more. I will admit that one of the reasons I am not a very fast learner is that I need to practice all the time, but you must
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