You should never leave Salmon or any other fish marinating overnight because if you marinate the salmon or other fish overnight the salmon or fish can become mushy and fall apart.
Salmon should be marinated for no longer than 1 hour while in the refrigerator.
When marinating salmon or other fish it takes between 30 minutes to an hour for the salmon to finish marinating which is long enough.
If you leave the salmon or any other fish marinating longer than an hour the fish or other salmon can begin to get mushy.
Then as the salmon or other fish becomes mushy it then begins to fall apart.
I made the mistake of marinating salmon overnight before and it ruined the salmon.
I then found out that I should not marinate it longer than 1 hour and after finding that out the salmon has turned out just fine when marinating it.