How long do you want to stay underwater? There is an acceptable amount of residual inert gas that can remain, which will work it's way out over a surface interval. You can look at M-values and percentages, which is not an exact science, to get an idea of how 'clean' you will be. But, everyone is different in there tissure composition, so go luck finding an exact value.
So to give you an answer: Some of it, most of it, all of it, it depends.
