This depends completely on the size and thickness of your fillets. For the 6 oz fillets pictured (about 2 inches thick in the middle), I like cooking in the oven for 12 minutes exactly using the 450°F/reduce temp when pan goes in method. For smaller fillets, 4-5 oz, I'd start checking at 8 minutes. Err on the side of underdone because the salmon will keep cooking for a few minutes after removing from the oven.