From Sally Prince Davis, in the March 1992 issue of The Artist’s Magazine:
For every hour devoted to painting, set aside an hour for business. Unrealistic? No, because “business” includes stops at the art store, phone calls to a gallery, research trips to new outlets, days spent at booth shows and trips to the printer for new business cards. Business hours don’t have to equal painting hours on a daily basis, but you should pay some attention to business every day.