Rolex Time Sand is packed in 30 kg bags.
I guess it makes sense that if an hourglass were to have any chance of accurately providing some measure of time, the sand would have to be of a uniform size, consistency and texture. And if any company on Earth were qualified to produce a sand used for timekeeping, it would be Rolex. A single bag of Time Sand flowing through a standard hourglass is the equivalent of 30 days, and the pallets and pallets of sand you see below represent a generous estimation of an average human lifespan. (81 years)