not to mention the time taken to drill through military armour for each compartment on a multiple deck 253 meter long ship (fenris/lev)
But it wouldn't be any different if you were pumping in gas, to which I answered.
Also you don't need to drill into every single compartment most likely. If you know were in the ship the main and backup lifesupport is located, you can drill directly towards those sections and even if other compartments retain the oxygen already inside, that won't last for long.
And even if you don't know that, just drill towards the biggest concentration of lifesigns, untill the detected signs are few enough that you can go in with a comparetilvely small troop detachement to mop up/round up the last few survivors.
Also you won't need a 250 meter drill for a Fenris. For one thing you can drill from the sides and for another from both sides. Now if the ship is 50 meters in diameter, that would mean a 25 meter drill can reach every point in the entire ship. Opening every single compartment is going to take it's time, but as I explained before it won't be necessary.