Originally Posted by
LupineChemist
There's actually a fairly large bank of flights around midnight so passport control can be rather full around then. Granted if it's an EU passport then the automated gates take 30 seconds.
Automated gates not always working. Sometimes only some of them are shut down, sometimes all. OP, also to consider, your FLR to MAD flight is at the end of the day, meaning that any delay on any of the plane's earlier flights will be carried over to yours.