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Sand of Hours

from Zeldapedia, the Legend of Zelda wiki

Sand of Hours is an item from The Legend of Zelda: Phantom Hourglass. This mystical sand is a key component of the Phantom Hourglass: The more Sand of Hours Link obtains, the more time he has inside the Temple of the Ocean King before the Phantom Hourglass runs out. When the sand runs out, Link will take damage if he is not in a Safety Zone. In order to refill the Phantom Hourglass when it has run out, Link needs to go outside the temple.

Sand of Hours can be obtained after defeating a boss, as well as found in chests salvaged from beneath the Great Sea with the Salvage Arm.