Spend 10 minutes or less with each person you meet, and don’t linger with friends or associates. If your goal is to meet a given number of people, be careful not to spend too much time with any one person. When you meet someone interesting with whom you’d like to speak further, set up an appointment for a later date.
From Ivan Misner is founder and Chairman of BNI, a professional business networking organization headquartered in Upland, Calif. Dubbed the “father of modern networking” by CNN, Misner is a New York Times bestselling author.
source : http://www.entrepreneur.com