My Terracotta grilling plate does not heat or it takes long time to heat.

The main material that this plate is made of is clay, and clay heats up differently. It is more difficult for this type of material to warm up (around 10-20 minutes) than the metal grilling plates. Once the griddle reaches temperature, it takes more than 20-30 minutes to cool down, making it perfect to take to the table and finish cooking on it.