FOR REFERENCE:
2x gravity = 2 g, which is apparently 2x9.85 on this sekai rather than Earth's 9.81 m/s2
At 3 minutes (180 s) under upwards acceleration of 2 g, it would reach a velocity of -19.8 x 180 =3564 m/s
For reference standard atmospheric pressure on the Earth is due to the distance to...