Frankly there are too many variables. Thanks to Brexit the British passport holders arriving anywhere in Europe are now obliged to go through with people who have to have Visas etc.

You can disembark and speed off to Immigration to find that flight from Qatar, Tunisia, Morocco or Turkey has landed before you with all their passengers requiring processing by the police.

I only think that this really matters, it’s one has an international two domestic (or vice versa) that has to be done. I quite see the purpose of the OP’s question but really it is impossible to tell. Two weeks ago we landed at LAX at 18.00 approx and were through Immigration like a hot knife through butter. I was amazed. I was in J on the A380 so we were not first off.