To give you some concrete data: Right now you can do on GDAX and sell $10 million in BTC with only about 5% slippage. If you spread it out you can sell $100 mil

To give you some concrete data: Right now you can do on GDAX and sell $10 million in BTC with only about 5% slippage. If you spread it out you can sell $100 million in 6 months no problem.