Me and my sister were building on our map and a pop-up in the left corner said “server will be shutting down soon” but it never did, just wanted to let you know.
Maybe you were adding too much stuff too quickly, but if nothing happened then it should be fine.
It takes a while, but if you were playing for a long time, it pops up.
It takes 5-20 minutes for it to shut down, according to experience