OK...I'm on this website everyday and will be trying my hand at incubating my own eggs in a couple of weeks. I'm confused about when lockdown starts. I will be using a separate incubator as a hatcher. I've seen posts that say start lockdown on day 18, but that would mean a 4-day lockdown? Or is lockdown after the 18th day, on day 19? That would be a 3-day lockdown. Thanks.