Very few! An ounce is 28350 milligrams
120 ounces = 3 401 942.78 milligrams
8 oz = 226796.184 mg
84878.47223625 milligrams are in 2.994 ounces.To trust this answer you can check this website and convert 2.994 ounce in milligrams.
190 mg = 0.006702 oz
There are 28349.523 milligrams in an ounce.