Power off (time switch)

Ok here is the point, I need to make a timer switch, I mean I've an electric dice, when I press a switch the roll stops and then timing starts, when the counts equals to 6, the dice lights must go off. For this I'm using an astable timer for the roll, a 4017 for the dice, a flip flop D for the switch memory, and for the power off part, I was thinking that I must use a six second one shot timer, a flip flop JK and a relay. Could someone help me with the conection of the power of part?