The number of continues increases with the total number of hours.

Continues	How to unlock
2 Continues	Game Time of 0:00:00-0:59:59
3 Continues	Game Time of 1:00:00-1:59:59
4 Continues	Game Time of 2:00:00-2:59:59
5 Continues	Game Time of 3:00:00-3:59:59
6 Continues	Game Time of 4:00:00-4:59:59
7 Continues	Game Time of 5:00:00-5:59:59
8 Continues	Game Time of 6:00:00-6:59:59
9 Continues	Game Time of 7:00:00-7:59:59
Free Play(Unlimited Continues)	Game Time of 8:00:00 or more