pregnancy lengths, moms of more than one

Please let me know the length of each pregnancy. I am on my third  and am due right around Christmas. I was curious, if you have more than one child, did you subsequent children stay in longer or shorter? I am mostly looking for natural start to labors, no inductions to get the best idea. Thank you! If you did have an induction or scheduled or emergency c section, please state that as well. Thank you ladies!