An hour's worth.
glass+sand=hourglass
glass+sand=hourglass
sand + glass = hourglass
sand+ glass =one hourglass
glass+sand=hourglass
glass+sand=hourglass
The ''Sand Clock'' is really called an Hourglass, and the reason for that is because it takes the sand and hour to reach the other end of the glass. An hourglass is a curved shaped object that has two ends. The hourglass Has sand inside it which Is placed at the bottom of the hourglass, but when you turn the hourglass up side down, the sand slowly runs through a hole to the other end of the glass. When the sand has finally finished flowing it will end up looking like how it was in the first place.
Hourglass
in legent of zelda,you has new sand from boss(if you win)and the phantom hourglass works ONLY on the temple of the ocean king.
Sand + glass = hourglass, hourglass + life = time. <3
It was described in 1338, so probably sometime before then.
it is a clock that uses sand to measure time