Final answer:
The central theme of the play 'Killing Time' is the exploration of human existence, the challenges faced by the characters, and the passage of time.
Step-by-step explanation:
The central theme of the play 'Killing Time' with Mitch, Michael, and Devon is the exploration of human existence and the challenges faced by the characters. The play delves into the complexities of time, the absurdity of life, and the existential conundrums that individuals may encounter. Through the interactions and experiences of the characters, the play highlights the themes of mortality, the passage of time, and the search for meaning.