[In some ways, controlling the time flow within the train's interior wasn't without a price.]
[So while you'd be able to spend more time inside than outside, which was useful for training, your lifespan would also be extended by the same amount of time you spent outside.]
[If you ever spent a hundred years inside while only fifty years outside had passed, your body will truly age a hundred years rather than just fifty years.]
[In other words, it was mostly useful for those living beings with high lifespans, as they could abuse their high lifespan to spend more time than beings with low lifespans.]
[You didn't care about the downside of the accelerated time flow, as it wasn't a problem to you since you were not only at Peak Platinum rank, but also an Arch Human.]
[Your lifespan was quite long, to the point that you are more likely to die in the doomsday life simulation due to encountering a powerful entity rather than natural causes.]
