In Night, how long were author Elie Wiesel and his father at Auschwitz, and where did they go after that?

In Elie Wiesel's Night, Elie and his family were first taken to Birkenau, the reception center for Auschwitz, one of the notoriously terrible death camps during the Holocaust. Elie and his father then stayed at Auschwitz for about three weeks before they were marched to another camp with many other prisoners. The next camp in which they were imprisoned was Buna. At Buna, Elie, along with his father and other prisoners, worked at an electrical warehouse during the day and returned to the camp in the evening. Though their supervisor was prone to violent outbursts and often attacked one or more of his charges, this was considered a good unit, so Elie thought himself lucky. Imagine conditions so horrible that working for a crazy man, who might beat him at any minute, made Elie feel "lucky"!  It was a terrible time in our history.