Time (時, Toki
?) is a gameplay mechanic in
Lightning Returns: Final Fantasy XIII, denoted by an ever-present "doomsday clock" on the right side of the player's screen. The player has a maximum of fourteen
days to finish the game. Each day begins and ends at 6 AM; at that time
Lightning is automatically returned to the
Ark where her
HP and
EP are restored.
Because the player has a limited time to finish the game, and because certain areas,
quests, people, and events are only accessible during specific times of day, time management is an important element of gameplay. If time runs out before all five main quests are completed, the
Apocalypse will occur and the player will be given an option to restart the game from the beginning.
http://finalfantasy.wikia.com/wiki/Time_(Lightning_Returns)