Richard,I tried a little over an hour last night. Not sure how long they were on as I was getting my whole chicken ready. I want to say they were on about 1.5 hours, but not sure... That is why I thought I needed to remove the pizza stone, I wasn't sure I was getting enough heat to them. PS, I was cooking at about 375... I am just perplexed as to how to get them to cook through...Thanks... ...AnnaG...