According to Andy Hall Cutler author of Amalgam illness it could take 100 years without chelation.
I would, from my experience say 5 years to remove body mercury using ALA alpha lipoic acid, 10 years to remove brain mercury. Thats with a lot of exposure,17 Amalgams for 42 years.
If you eat fish or consume aluminum ,or other chemicals you can have many of the same symtoms.
In two years you should see improvement in mental symptoms.