Time limit on Chaos dungeons

I just failed a Chaos dungeon because I disconnected in the middle of it. When I got back in I had 30 seconds to get 40% which is impossible because of the slow spawn time of mobs.
How does it even make sense to have a time limit on content that is practically impossible to lose unless you, like me, disconnect in the middle of it. That coupled with the fact that disconnecting immediately throws you out of the game and not just back to the serverlist blows my mind. It wouldn’t be such a big problem if the game didn’t take minutes to launch.

It’s nice to get all this QoL, but there are still archaic systems in the game that you won’t find in any other game released after the 90’s.