it is not easy to calculate on bittrex cause some fellas set buy orders for 25k satoshi.
That nerves.

Are they stupid or is that tactical?
I guess about 50- 55 BTC refunded on Trex.
From reading previous posts, Bittrex put up a 420 BTC buy wall. Right now 372 BTC remains, meaning that 48 BTC worth of BLOCK has been refunded.
I'm keeping mine, and will not be taking a refund. Just waiting on the 48 hours to finish, so I can transfer out of the exchange and add to my wallet.