I connected few a few weeks ago. It was a nightmare. We landed from London over an hour late, leaving about 40 minutes to connect to Bilbao.

Thankfully I was off very quickly. Big line for non-EU passport, and managed to sweet talk my way to the front of the line.

Ran to the train and just squeezed onboard. Long train journey when you're in a rush!

Transit security was a mess. No fast track or short connection line was open, despite signs to the contrary. Again pleased and thank youed to the front of the line.

Then had to run to the gate where boarding was nearly complete.

AWFUL.

Will absolutely never plan a MAD connection again if at all possible. Zero chance I would've made it if I hadn't of pushed to the front of every queue, and no attempt for any staff to help people with short connections.