[tylersmith]

According to coinmarketcap.com volumes on gdax for btc and eth and $115mm and $53mm over the past 24hrs. If you didn't want to increase overall volume by more than 10% you could sell out to USD around $12.5mm btc and $5.3mm eth per day.

[runeks]

Volume is not liquidity. You can’t deduce anything about the impact of a $10mm ETH market sell from looking at volume.

If you dump $5mm ETH on the GDAX ETHUSD market right now, the price would fall from $290 to $250[1].

[1] https://www.gdax.com/trade/ETH-USD (click “depth chart” in upper right corner)