Well, it's Day 20 and when I checked on them this morning, #4 egg was well on it's way to hatching!

It ditched the shell completely by 7:50, and is now resting, waking, cheeping for the others to join her.

Tiny little thing. Not much bigger than a quail chick. Don't see any activity from the others yet, but then it is only Day 20. Unless I've mis-counted, which is entirely possible.
RIP Scooby, AKA Awesome Dog. Too well loved to ever be forgotten. "Sometime in June", 2005 - January 24, 2017.
"Until one has loved an animal, part of one's soul remains unawakened" - Anatole France