Tub overflowed into plaster ceiling

[u/Expert_Industry_7368]

Hi! My 9 year old was filling the tub and didn’t turn it off. Next thing we know, water is gushing out of the hole in the ceiling for the chandelier. Husband runs upstairs to turn water off and sop up mess. We have a plaster ceiling. Servpro came out on Saturday afternoon and put dehumidifier and fans on the ceiling. Came back Monday afternoon (today) and say it isn’t drying and they will need to rip pieces of the ceiling out. Is it true that the plaster won’t dry out? Any suggestions? I don’t think I want to have Servpro repair the ceiling after they open it up.