Time Limit: 6 или 4?

I agree that 6 minutes is a good time limit and there's no need to rush. You can sit back, play, carefully consider your moves, build a chain, take dwellings, and so on.
But time flies!
Especially when you can't rush and the game drags on, sometimes, by chance, a disconnect occurs. And then it starts: you deliberately left, it was my game, what are you talking about, and...
In most cases (I'm not good at rushing), it's the length of the game that leads to a disconnect!
Can you explain this?
I hope to switch to 6 minutes soon, that is, when I learn to build a chain!