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by nextw33k 4142 days ago
28th Dec: "Exco.in surpassed 60 BTC 24H Volume" https://blackwavelabs.com/

It seems to have happened over a 5 day period. So a back of the packet calculation: 60 x 230 * 5 = $69,000

Of course that doesn't tell us anything about if people had larger amounts stored, just that the hot wallet should have contained around that amount before they needed to refill it.