Daily. Regardless of whether we will be at the same meeting or not. I struggled with this for years, just like you. I just didn't think I even needed a sponsor. When I got my current sponsor, I made a commitment each day to call him. Before long it became habit and routine, and then I started calling other alcoholics. The only way I was going to develop a relationship with my sponsor was by communicating with him, which in turn has become very important as we move through the steps.