I'm too lazy to write a whole explanation but different parts of the QT work differently and time moves differently.

So you are saying that there are some part of the QT where the speed of time is same as the speed of real time.

The time is variable. Scott happened to get stuck in a point where time was distorted in this particular manner, but it could potentially progress at a normal rate, or get distorted to a lesser or greater degree.

I don't know. I don't feel like MCU explained everything we need to know about quantam tunnel.

I guess you gotta wait until Ant-Man 3.

It's called Ant-Man and the Wasp: Quantumania btw

The quantum realm consists of layers that are in continuous movement

Remember in antman and the wasp they had to get Janet in a certain amount of time before the quantum layer moves and gets hard to locate