From the second though Hulk snaps his fingers to the second Iron Man does, that is 45 minutes of fucking THIS SHIT IS FUCKING AWESOME. Its not just one single fight sequence, there is an ebb and flow I really appreciated a lot more on second watch, with so many iconic moments now like Cap standing solo against Thanos or the 3 main guys going in or Cap going super saiyan with mjolnir or Hawkeye radioing in or AVENGERS, ASSEMBLE. 15 seconds of a dumb "lets go, girls!" doesn't ruin the other 44 minutes and 45 seconds. I also really like on second rewatch how Tony beats Thanos not by being stronger or more powerful than him, but just outsmarting/tricking him.