Hello,
we also had water in the basement due to a storm, and that was already after we had moved in. We immediately hired a specialized drying company that started drying the very next day.
In our case, the screed was drilled in several places to remove the water that had gotten underneath (you could even see the water in the insulation there!). The drying devices ran around the clock for almost 2 weeks (dryers, fans, and a special device that dries the water under the screed). Meanwhile, our basement is completely dry again, and we were lucky to have taken out [Elementarschadenversicherung] that covered all the damages and the drying.
Water in the basement, especially when the screed is already in place, is no joke because you yourself cannot estimate what damage it can cause.
Best regards