Why should you practice?  Why should you spend the rest of your time just to practice guitar?  Well the answer to this is very simple if you really want to be good in playing the guitar there is no other way but to practice and practice religiously and practice hard and practice as much as you can.  Most beginner guitar players questioned me a lot about how often should they practice.  I said, should practice as often as possible.  Even the greatest guitar players are still dedicating hours of their time just to practice.  They always thing there is always room for improvement even if they are already there on that level of guitar playing which we call legendary.  If you can see their attitude towards practice, you would see that they treat practice, like something very important, something like a religious ritual.  Something that is a very important part of their lives.  And not suggesting they should practice the whole day, because as ordinary people, we have things that we should do in our everyday lives that doesn’t include playing the guitar.  On that case, you can spend two hours of your time for practice, or you could set any vacant time that you have for practice.  But if you doing this as a profession, you should definitely spend more time practicing.