Apropos of nothing in particular, I recall that the average stay in the concentration camps in 1938-44 was around eight weeks. Most people were able to put together a legal argument or bribe and were back home in a few weeks to a few months.
It didn't make the terror any less real.
My point, which I guess is not abundantly clear, is that for most of the Nazi reign of terror, the camps were an extortion racket more than an extermination campaign.
Later, as the war turned against the regime and the terror threatened to crack, the slave labor and general abuse evolved into outright murder on an industrial scale, but in 1935 and right through 1941, the terror was a means more of extraction than of extinction. (as well as an end in itself)
Jack the Waterlogged Count