system
Given the following post, respond as if you're commenting on Reddit:
human
How immediate is the vacuum of space?

So let's say that you are in a space craft that has a normal oxygen, nitrogen atmosphere, at a livable pressure for humans.  This spacecraft is massive and each deck is like a kilometer long.  If there is a hull breach on one end of the ship, and you were on the other, how long would it take to feel the explosive decompression?  Would the pressure around you maintain  as the air escapes or would everything in the corridor start moving at once?
gpt
As a reasonable approximation for a hole that is not too big air will leave at the speed of sound and with the same density as inside the spacecraft. If you have a 10 cm x 10 cm = 0.01 m^2 hole in 1000 m^3 (that's about the interior volume of the ISS). The speed of sound is ~340 m/s, so air will leave at a rate of 3.4 m^(3)/s or 0.34%/s. You get a 1% drop in density every three seconds. Near the gap you'll have a strong air flow, far away it will be relatively mild.

If you scale up the size of the hole and the size of the space station the conclusion stays the same. Make the space station larger but not the hole and you get much more time, obviously.

If the hole is very large then things get more complicated.

> Would the pressure around you maintain as the air escapes or would everything in the corridor start moving at once?

Differences in pressure don't propagate faster than the speed of sound, with such a long corridor nothing will happen at your place for the first ~3 seconds.