When I wrote a post on cedar plank salmon, an anonymous person thought 20 minutes was too long to cook the fish and that something was wrong with my grill. I decided to look up some other recipes for cedar plank salmon and found out that 20 minutes was not out of line. Bobby Flay cooks his that way as does Elizabeth Karmel in "Taming the Flame". Then I took out my package of cedar planks and actually looked at the instructions and they also say 20 minutes. As I said in my post I like my fish well done and after 20 minutes minutes on a plank , it comes out perfectly cooked and nice and smoky. I prepared it again last night just to make sure. This time I used the same marinade recipe, but added 2 tablespoons of soy sauce and made sure to salt and pepper them before grilling.