There's been a sharp increase in bitcoin fees again, so if your ultimate destination is fiat (USD, EUR, etc) and you are using https://blocktrades.us to sell Steem or SBD, then I recommend that you consider receiving Litecoin or ETH instead of BTC as your intermediate currency. This will get your money to you faster and with less fees.
We have BTC that we've sent out that is still unconfirmed after 9 hours.
A similar rule applies if you are buying STEEM/SBD. I see a lot of unconfirmed BTC sent to us right now, going back over 9 hours as well.