It currently takes 100 hours. For records that date back to the 1970s it takes roughly 100 hours per file. When we first started we had records going back to the 1960s. Those took about 150 hours per file. As the decades move on and more is automated and less is non-automated, that time shrinks, which is where we see the processing improvements.
On December 14th, 2011. See this statement in context.