How much time can a person devote to time-saving? When people come to you with demands on your time, don't say maybe. "Try to say yes or no whenever you can" (tip No. 306). Then again, don't say yes or no right away: "Say, 'I need twenty-four hours to think it over' " (tip No. 20). Then again, don't say yes at all: "It has been said that the two-letter word no is the single most effective time management tool there is" (tip No. 83). Then again, if you do master the art of saying no, you had better hope your friends haven't mastered time-saving tip No. 338: "When you meet a negative person, find a way to end the conversation and walk away. A negative person is one of the biggest wastes of time!"