Does anyone know what happens when you are inside a delve during the daily reset?
A humongus portal opens up and you are stuck in place as parts of you are ripped apart and consumed by said portal until your head being the last piece explodes and the game deletes your toon. 
The world restructures around you as the npcs all leave the delve and setup for the next story occurs.
You don’t come back to the delve and continue it, if that’s what you’re asking.
You’re probably tossed right out. It will most likely not be Bountiful anymore, either, if it was in the first place.
Shift change for the NPCs, the fresh guys show up for their shift and the guys getting off head to the bar.
You will login and find yourself outside the Delve and it will be reset
Nothing.
Once inside a bountiful, it remains bountiful until completed or if you leave and let it reset.
All of your teeth fall out irl
Thank you 
That is some Truman Show level stuff right there lol
Personal head cannon is that all delves are connected via underground tunnels like Disneyworld. The npcs just conduct shift changes through them each day.
They use the same rocket powered trams as undermine.
Good question. How will this impact the economy?
The entrance collapses with rubble and you character is trapped in there forever. Ol’ Bran doesn’t have yer back and the spirit healer is off on break.
You just doomed your character. Good job.
Exactly this. If your already in the delve, then it stays what it was before the daily reset. If it happens on a day, they do maintenance, I am not sure, but I think as long as you get back in the delve before 30 minutes elapses maybe you can continue the delve.
Bronzebeard eats you
Ever seen the movie “The Langoliers”?
That.
Careful you end up between Delves.
Iridikron shows up at level 110 and tells you that you found him too early.