yes exactly.............that judgement comes with exposure and experience on type. Knowing the exact delays in the A/B system might be "nice to know" but it's not necessary.
And I've never come across anyone in 25 years of Airline ops on the 737, 747, 777 and indeed the Airbus family of jets that can tell you these numbers. We know what our Jets are capable of and we've seen it under all sorts of different conditions.
Sorry to be direct but you need to get a life.
Save your brain cells for something more important, like remembering which bar has the nicest birds on ur overnights.
