Not that long, I was able to send over my newly-bought BTC from Coinbase to MintPal 30 minutes ago and bought in about 10 minutes ago.
But ya, there are many asleep in Euro-land right now who will wake up potentially to 0.02+ potentially.
This will take time to percolate.
JL
Don't underestimate how pissed they are going to be as well at that fact...