I generally heat soak for an hour once my temp gets dialed in. For pizza I'll do about an hour and a half. For cooks that need to go on the grate very early in the morning, I'll fire up the KK, set an alarm and go to sleep, get up and put the cook on the grate, and go back to bed. That means the KK can heat soak for 5 or 6 hours. No big deal.