LeMasterParty,
It's possible for them all to hatch, but it depends on a huge list of factors. If they've been shipped, how long between laying/setting etc...
I had one out of 21 hatch, because I messed up my humidity in my first try and then I had 20 of 24 hatch in my second try. My egg...
Just set 24 eggs in my incubator today. Expected hatch date March 22nd 2015.
Welsummer x 3
Maran x 1
Leghorn x 12
Buff Sussex x 1
Cream Legbar x 5
Golden Laced Wyandotte x 2