Cooking salmon is as easy or as complicated as you wish it to be. You can base it bourbon or dip it in a Thai-ginger soy sauce, you can grill or bake it (though some adamant grillers would argue that grilling is the only option, because of how it preserves the flavor), but the question remains, how long to cook salmon?
When grilling salmon, for every one inch of thickness you should cook it for 10 minutes. This can depend however on your grill and can range from 6-8 minutes per side. A filet normally is more or less 1 inch. Turn the salmon one time while grilling. Salmon continues to cook, even after being taken off the grill, so remove it just as it is opaque throughout. Because salmon keeps cooking after you take it out of the oven or off the grill, a general tip for cooking salmon is to undercook it a little. To ensure the salmon is done, cut into the thickest part of the filet and check the color.
Baking salmon is also an option, especially in the winter months, when grilling outside is less than ideal. A rule of thumb for cooking salmon is to bake for 10 minutes per inch of thickness @ 375 degrees. This would work for both filets and steaks. However, depending on if you like your salmon moist or drier, and depending on what a recipe calls for, how long to cook salmon in the oven can vary between 25-45 minutes.
To bake in the oven, place a normal size filet in a baking pan with some olive oil, and an accent flavor like salt or basic spice mix, soy sauce and ginger, or lemon juice and white wine, or maybe honey and mustard. Then place the salmon in the oven at cook until it turns a light pink color throughout.
If you do not like salmon skin, don’t spray the baking pan and the skin will likely stick to it when you remove the fish.