Yeast cake in the becca of Uri Sheft from Bread Bakery - voila! Food. Do you still use measuring cups and spoons? It's good and beautiful and nice and this recipe also contains them, but it's time to buy a kitchen scale for nothing, you'll see that you get addicted to working with it very quickly.
The process takes about an hour, depending of course on the room temperature. The goal is for the cakes to add about 70%-80% volume.