In the Refrigerator. Salmon can be kept fresh in your refrigerator for up to two days. As soon as you bring your salmon home, unwrap it and wipe it down with a damp towel then wrap it in plastic wrap and place it in the coldest area of your refrigerator. This is typically the back of the bottom drawer in the refrigerator.
How long a person should stay in a steam room will depend on the person and how long it feels comfortable to sit in the steam. Expect to stay in a steam room for about 10 minutes with insight from a nutrition consultant and clinical herbalist in this free video on steam rooms.
When something is in a steam table for 4-6 hours at 140 or above, it will start drying out - unless you add back in moisture, and it will start getting that nasty scum on the edges and all of that fun stuff. You have compromised the quality and cooling it and re-heating it, isn't going to make it nice again.