system
Given the following post, respond as if you're commenting on Reddit:
human
[Avengers: Endgame] (SPOILERS) If Scott Lang was in the Quantum Realm for...

5 years and it was only 5 hours to him, how did Janet van Dyne’s hair turn gray in 30 years/30 hours?
gpt
There's nothing to suggest that this time dilation in the Quantum Realm is *consistent*.  Perhaps some of the time Janet was gone passed faster, and some of it passed slower, depending on where she was, or what she did, or just the alignment of particles, or who knows what other quantum science-y things.

Just because Scott experienced five years as five hours, we can't say for sure that all visitors to the Quantum Realm experience time the same way he did, in that instance.  In fact the entire time travel plot strongly suggests that time and the quantum realm don't have a fixed relationship.