Hello 4support ~
The antidepressant effects can be felt usually around 100mg and the mood stabilizing effects usually kick in between 100-200mgs. Some people need to take as much as 400 mg. to receive the same benefits, but for most there is no need to go over 200 (depending on what else you're taking.)
Wonderful news that your husband is developing some self-awareness. Thanks for letting us in on the good news. Now if you can get him to stop drinking he'll really start feeling better.
Hip, hip hurray