One playthrough of Niji Shindan (which is short for Nijisanji no Type Shindan) takes about 40 minutes.
Mito Tsukino of Nijisanji uploaded a free visual novel game called Niji Shindan that will tell you which Nijisanji VTuber you are most similar to.
Nijisanji no Type Shindan is available in Japanese on Windows PCs and in browsers for free.
Nijisanji no Type Shindan, which literally translates to “Nijisanji’s Personality Test,” uses the choices you make while interacting with Nijisanji members to determine who you’re most like.