I need three explicit times: one for when they lose consciousness, one for when they should be dead, and one that shows how long they should have been dead. I need these to set up an apparent miracle.
The first number depends on the size of the hole, so I chose 6 and made the other numbers around the same order of magnitude, leading to approximately 1/6 of an hour to get them aboard. I'm fine with 1/4 or 1/3 of an hour, too. Admittedly, I did a total asspull on 9 and 11. If you know how long it takes for them to pass out, then you can probably calculate how long before they die, but the equations are over my head. Also, it's probably too short, since they have to repressurize the raider before going in.
For your calculation, if they were to reverse thrusters (assuming they were working) and rely on the splat inhibiter, don't your equations become irrelevant? Is there something fundamental in physics that says I can't slow them down more quickly in spite of having the inertial damper?