I work on only one hub at a time. It gets my undivided attention. I like the feeling of accomplishment, and completing a hub by my personal schedule helps me feel that. I usually can only work on two hubs per week, and it takes me anywhere from 2-4 hours to complete it with research. Other than my hubs, I do write books too. I spend nearly two full days working on those (if I don't have too many interruptions).