[iliicit]

There is so much volume and volatility in Bitcoin markets that a whale can sell insane amount of coins (e.g. 10k) in within days without much effect on price. Placing limit orders in front of the best ask and moving them in case the price goes down will do the trick. Bitfinex traded over 100k coins within last 24 hours. it's reasonable to assume that you can capture 1% of this volume on the daily basis using the limit orders. Selling 10k Bitcoins can be easily done within 10 days without pushing the price down. I think it's possible to do this within 1 day.