It depends on how you want to treat this business full time or part time.You need to read and find answers to questions from your downline that will help them to be successful.You need to know how your downline is doing.You need to advertise your business.Perform various activity.All this and more takes time.Taking at least 35 hours a week may be good for full time and at least 14 hours a week may be okay as part time.