such a speedy reply from embicoin! but I edited my last post.
Also  I visited the suggested exchange cryptorush and see this red message:
Slow Deposits/Withdraws
Due to the volume of AUR and BTC, we're having an issue with deposits and withdraws running much slower than they normally do, due to lag between our blockchain. The good news is everything is safe, just a lot slower. Sorry for the inconvenience this causes to everyone affected.
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Does anyone know how many confirmations from blockchain is needed for deposited BTC to be credited into your account balance and what they mean exactly by deposits and withdrawal are running much slower than normal?   You see I don't want to waste time waiting like 6 or more hours when it could be 1 hour elsewhere.