This year I will stop turning about 5 - 7 days before the "expected" hatch date. Last year we really had some wonky issues and all the clutches began EXTERNALLY pipping day 30-31. I had intended to stop the autoturner... day 32. It was no surprise like 75% pipped at the wrong end. In one clutch I ended up losing 50% of the externally pipped wrong end ducklings--the ones that survived only did so because I intervened (I didn't realize they even pipped until I luckily walked by and heard peeping). It was a nightmare. So this year I'm taking precautions and am going to stop turning a week before just in case something like last year happens again.