Russell works as an engineer for a biotech firm and earns a salary of $80,000. In addition, he is part owner of two retail stores. The first store sells plants and flowers and generates a loss for the year, of which Russells share is ($105,000). The second store sells tools and equipment, including a garden section. This store generates income of $60,000, as it has for the past several years. If Russell comes to you in October and tells you that he has spent 400 hours at each store so far this year, how much time would you advise him to spend at the two stores between now and year end? Please answer using only the 500-hour material participation test.