How long does it take for the MediCrystal mat to reach the highest temperature?

If the mat is covered with a thick fitted protector or blanket or your body is on the heating pad, it starts to heat immediately and reaches its highest temperature in about 30-60 minutes.

If the mat is uncovered, ambient temperature is low, and the airflow is high, it may take the mat 1-2 hours to reach the maximum level —but it may still never reach the same level as if it were covered.