The authors also report on a manual tagging experiment (without automatic pre-annotation); they observed an annotation speed that is around 1, 300 words per hour.
it is probably safe to assume that, on average, the creation of a manually validated training corpus starts at a speed that is around 1,000 words (30 sentences) per hour, and increases up to 3, 000 words (100 sentences) per hour once the corpus has reached, say, 5, 000 sentences.