The lead ship sent the precise time and location coordinates for where they were, and Max began the calculations. It only took a split second to match the ship's clock back up with the rest of the world and realize that while they had spent over a day in the other layer of space, they had only been gone from here for roughly three minutes.
The time dilation at the site of their first fight had given him the impression that the time flow in that space was not linear. It was a solid theory involved in antimatter reactions and research, but non-linear time wasn't really something that the average person would normally experience.
If his calculations were right, it might actually be possible to exit the exact instant that you entered, but on the far side of the universe, and without leaving a trace. All they had to study was how to get around in that layer and how to tell where they were going to come out.