By my count Thursday 10-18 is day 21.We gave her the eggs at around 6:30pm on Sept. 26th.
You don't count the day you set, the next day is Day 1(I always miss that on mine).
They'll start to hatch between now and the weekend

21 days is an estimate.
Just listen for her talking to the chicks, then you'll know they've internally pipped,
then start listening for peeping. No Peeking! Good Luck!
Two are already sold and at there new home in the mountains.
We humans see chicken behaviour and compare it to us and think of it as mean and cruel, but it's not, the chicks have to go through a learning process and it's perfectly normal. Whitey will also have to go through a reintegration process to regain her place amongst the flock.