So I sync'd the different languages in the ship part of the main game, just to have a "visual proof" that Japanese saves ~1 second over other languages and especially English (which is the slowest language)

Otherwise I don't believe languages matter in any other part of the game when it comes to speedrunning purposes.

On a side-note; I tested and recorded that on "variable framerate" settings, so capping your framerate to 30/60 might influence phonecall's duration a tad bit.

PS: Put the video on 0.25x speed to clearly see the differences between versions