That's unusual for Coinbase, in my experience. They're usually
pretty quick with the outgoing transfers. If it says 0 confirmations,
you're OK though. You just have to wait, it'll be on the blockchain
eventually. Don't fret, your money isn't lost, it's just stuck. And
this is still better than what was happening earlier in the year. 11
hours is nothing compared to 72 hours or more.
The reason Coinbase is so slow at the moment is because of the upcoming fork. Everyone is transacting right now, which congests the network. They released a statement saying all transactions will be processed within 24 hours, so we will just have to wait and see.
Some are reporting 15/16 hour wait times and longer, so I don't think they are holding up to this promise, but in any case be aware that this is happening and there is no reason to panic.