How To Thaw Salmon In An Hour. Place the fish in a resealable plastic bag (if it hasn’t already been submerged) and fill a large bowl with cold water. It will take about an hour for the salmon to defrost, depending on its size and thickness.
The fastest way to defrost salmon is through microwave defrosting. The fish should be submerged for around one hour to defrost fully. Check to see if the salmon is defrosted.