For the board game described in Exercise 3, how will you combine components to model a trial?

Question:

For the board game described in Exercise 3, how will you combine components to model a trial? What is the response variable?
Exercise 3
Playing a board game", you are stuck in jail until you roll "doubles" (same numbers) on a pair of dice. You will simulate using random digits to estimate how many turns you expect to remain in jail. Identify the component if you were to run a simulation.