Cold Crash runs in real-time. If time goes by for ten minutes on Annas side, ten minutes will pass by on your side, too. Anna is not going to send you a message every minute, so from time to time, she will not get in contact with you, for minutes or even hours. As if the story would happen just this moment, in real-time, now.
Of course you can stop the real-time mode to read the story in your own tempo, without having to wait for Anna. We recommend the real-time mode for a deeply immersing experience.