Read again. Nothing to do with miners.
This was KRAKEN delaying the transaction.
The button was clicked to send money to an address. NOTHING showed up on blockchain.info for over an hour. I only saw "0 confirmations" after about 70 or 80 minutes.
What the above meant was that the deposits rec'd probably didn't have 3 confirms yet and they didn't want to spend inputs they hadn't deemed as fully deposited (requiring 3 confirms).
Or simply this, the hot wallet might have run out and needed to be refilled. Any trustworthy exchange is not going to have an automatic restock of hot wallet from cold cause that risks easy hacking bankruptcy.
I know all this.
The fact remains that KRAKEN (nothing to do with the Bitcoin protocol - transaction times or confirmation times) took over an hour to release the Bitcoin onto the network.
I'm not talking a huge amount here - it was only a few €100.