I would not question the report from our friend, however as he said he fast tracked by the despairing mass. What I can say is that as someone who - like most I suppose - hates to queue, unless I took the trouble to actually time a delay, 10 minutes would seem like half an hour.
But context is always important. On 22/9/17 Glyn Jones bragged to Simon Calder that 6 minutes was the longest time anyone had ever waited to pass through security at SEN. A proud boast indeed. And one I had hoped could be maintained give or take a minute or two as the airport expanded.