How long does it take WDW Dining system to update when park hours are extended?

I’m trying to move our dinner later now that MK is open till 8pm. They updated park hours this morning but I still cannot see past 6pm dining. I know they will extend them based on this and next weekend having extended dining hours too but I cannot get a later dinner just yet. Should I call? Does the phone line get the later times before the internet? Does it reset overnight? Thanks!

You might set a reservation finder for the time you want, and it will alert you when the time is open.


Thanks and done.