I think hes referring to playing on stage. Although I think Chris really hit the mark, Ras makes an important point. You really will see drastic improvement in your playing if you incorporate some form of stage experience with you lessons, practice routine, etc... Open Mic nights or open jam sessions at restaurants, bars, book stores, or coffee houses are a great way to break into playing in front of an audience. Its a great way to meet other musicians as well.

As for the person who started this thread, the amount of time you practice really depends on what you are seeking to accomplish on the guitar. If you want to play like Joe Pass, then set aside a considerable amount of time each day because you will have your work cut out for you. If you want to play Green Day songs, you will probably need much less time to accomplish your goal. (No offense to Green Day fans) There really is no set time. But you should make it a point to "practice" every day. Like Chris said, right now you have more time than you will ever have to practice. It gets much harder once you get a job, family, etc...