1 to 2% Salt is a very common amount in an Equilibrium Brine. If the Salt is 2% of the combined weight of the Water and Meat, one day or thirty days, the meat can't get saltier than 2%. If the Salmon had Spoiled over the 5 day soak, there would be no doubt about it and this thread would never have been posted.
Bottom line, we don't know how much Salt the OP used. None of us can accurately say, " it doesn't need soaking, " or " it needs to be soaked 5 hours " or " its way too salty and needs to soak overnight." There is no way to make any kind of recommendation. However, if the OP Tastes a sliver of his Salmon, he can then determine if it's fine as is, needs a little soaking or a lot of soaking.
I didn't think suggesting Taste Testing would stir up any controversy...JJ
OK---I see it now---The reason we differ is I never knew anybody used an Equilibrium Brine when Brining Salmon. Bacon yes, Salmon No. If that's really true, then I'm wrong on the original disagreement. I'm used to Brining 4 hours for thin pieces of Salmon and 6 hours for thicker pieces of Salmon, and by no means anywhere close to Equilibrium. And then all I have to do is rinse my pieces off---No soaking at all.
Xin Loi,
Bear