Prompted by what Willy said a few days ago about a transfer taking 18 seconds, I decided to time it myself - but I failed to establish an exact timing.
I set up a transfer last week, then went into my UK bank account to do the transfer to Transferwise. When I clicked the final button on my bank account, I started a mental seconds count and logged into my Bankia account, which took about half a minute. The money was already there.