Considering you can get full on 1shotted and its already confirmed if you return you get taken out the dungeon or if you dc you go out the dungeon, its no surprised.
They never said you can't re-enter all they said is you will log back in at the entrance (outside). Secondly why would you return when everyone should have raise.

Also what if I want to spend the night dungeoning? Why should I be forced to do 1 then do another hours/days later? Why cant I blast out 3-4 runs in 1 night (3-4 hours that is respectively) and if its hard good, it will make completing worthwhile, and then we can do something else next day or whatever since I have busy RL so I cant play a lot, thus being able to do things when I want and not when SE wants is absolute win.
Still shortening content life expectancy no matter what spin you put on it.

Plus you need a minimum of 8 to enter, you are not always going to be able to keep 8 people on all the time or have 8 friends who play 24/7, some might, but i dont really. I dont want to join randomers due to the shitty loot system so sometimes I am forced to wait due to the nature of not everyone is online.
There are more linkshells on each server than I can count on 2 hands that have more than 15 people online at all times. The only people who will have this problem are those that a) have no LS or b) play 1 hour a day.

A lot of you are way too worried about people boosting them out in a day or week and then complaining again, why you care!?!!? Thats gunna happen either way "omg so bored of dungeons, finished them all, wtf this shit?" or "WTF? 24hr timer? Just finished one and was so fun now im forced to wait another day until I can do it again?"
Im not worried about other people saying this because IM SAYING THIS. I also know everyone in my LS is saying this and I know of 10~15 other linkshells off the top of my head who are saying this.

When there is enough content, then we can have timers. Dynamis was fine being 3 day because there was other things to do during that time. This game has nothing to do during that time so dont ruin it!
Beastmen settlements/strongholds, company quests, new leveling system, other dungeons, frontier hubs and more side quests? we wont have content 1.18 ~ 1.19? You must have forgotten all that stuff.