They both said that endgame trailer will show only the first 20 minutes of the film.
I think this is possible because
1. They trolled us about the tile
2. I don't believe ant man can really return In the first 20 minutes. It should take a little time . Perhaps after 40 minutes or something
3. Widow had her infinity war hairdo in the first trailer. Then he how does she change it in 20 minutes?
So leave it to your thoughts