Basically it depends on the challis load bearing capacity on scaffolding, normally up to 300mm ht. can be stacked.
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The US quarter is 1.75 mm thick. One million of them stacked would be 1,750,000 mm high (or 17,500.00 cm, or 175 meters). In inches and feet, the quarter being .069 inches thick, one million stacked would be 69,000 inches, or 5,750 feet, or 1 mile and 156.6 yards.
The British One Pound coin is 3.15 mm thick, so a stack of 100 of them would be 315 mm high.
Not possible to give an accurate answer ! We'd need to know how high the building is, how many (and what size) windows, how many doors etc etc... and then there's the size of bricks to consider !
About 500