How long does an investigation usually take? July 28, 2021 21:43 This varies depending upon the complexity of the case and how cooperative the parties are. We usually complete an investigation within six months, although it could be much shorter or longer than this. Related articles When and for how long can benefits be claimed? What are the remedies to a discrimination complaint? Can my employer fire me for missing work even if I have a doctor′s excuse? Who has the burden of proving discrimination? Can I file for unemployment if I am still working part-time or working for another employer but laid off of one job?