It all depends on what phase of learning you are in. In this tip for Arabic learners, Jenn gives a break down of where most of your time should be spent; during the beginning of your Arabic study, the vast majority of your time should be spent with a trained tutor (or, as we call them at Shababeek, "nurturer"). As you progress, your time spent with local people should increase. Learn some of the "whys" in this episode.