The Avengers, aided by Tony Stark, decided to use Pym’s particles to reduce their size and travel through the quantum realm to reach key points in history. In real time, only two seconds elapsed between their departure and their return to the present time. Endgame’s writers go even further: as the characters explain, citing several films about time travel, their actions in the past will have no impact on their present. All the opposite of a Return to the future in sum. But this theory, on paper, is it really the road? When asked about this issue, Stephen McFeely and Christopher Markus confirmed the information to the New York Times :
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