This episode captures perfectly what every engineer responsible for a 24/7 service has experienced firsthand in his job.
Basically, you find an issue in the system that requires it to be down for an amount of time, then you proceed to beg management for a window where the system will be down to fix the issue, when you finally get the window it doesn't really matter how much you plan everything, there is always something that comes up unexpectedly during the process and you must improvise while time is running out.
Of course, the difference is that in the show story the service in question being down means there are lives at stake, not just the company losing money, but all in all it is the same.
I want to thank everybody involved in this show for taking the time to depict this so vividly, I was on the edge of my seat the whole time.