Which concentration camp did the Weisels spend the most time in after Auschwitz?

The Weisels spent the most time in Buna after Auschwitz, which was a subcamp of Auschwitz focused on the production of synthetic rubber. This camp was characterized by harsh working conditions, extreme labor demands, and brutal treatment from the guards. It held significant significance in Elie Wiesel's memoir, "Night," as it represented a period of severe suffering and struggle for survival after his initial experience in the infamous Auschwitz concentration camp. In Buna, Wiesel and his father faced starvation, physical exhaustion, and ongoing dehumanization, which deeply impacted their relationship and individual will to survive. This setting highlights the relentless brutality of the Holocaust, making Buna a critical chapter in their journey.

While the other camps mentioned such as Plaszow, Flossenbürg, and Ravensbrück were indeed important during the Holocaust, they were not where the Weisels spent the most extended period after departing from Auschwitz, thereby making Buna the correct answer to the question.