As far as I understood you want to make a heat treatments of boards, which are stored in a stack, correct ? The temperature of hot stacking should be between 50 and 70 °C, preferred around 60 °C, time is from my point of view 5 days minimum, longer is better, but normally there is a limited storage area. Take into account that the boards must be sanded after approx. 1 day and then stored again. Hope my answer helps. With E1 boards you will see improvement of mechanical properties, low emission boards will only get lower perforator by this.