Christopher Hitchens reflects on the phrase 'killing time' and its implications about how we perceive time in our lives. He points out the irony of using a casual expression that suggests we have the luxury to waste time, while, in reality, time is finite and ultimately leads to our mortality. By highlighting the crassness of this expression, he encourages a mindset shift where we recognize the value of each moment. Instead of viewing time as something to be idly spent, we should consider it a precious resource that shapes our experiences and growth. This perspective invites us to live more intentionally and make choices that reflect our understanding of time's true significance. Ultimately, it serves as a reminder that embracing the fleeting nature of time can lead to a deeper appreciation of life.