Hey I'm new to byc. I'm from Suffolk, UK . I have 5 Rhode island reds n 1 is broody so I brought her 6 Eggs 3 light sussex 3 black Orpington. The 3 lights have hatch on Tuesday the 2 Orpingtons haven't. We had 3 Orpingtons but one has completely vanished we are thinking either a rat got it or someone stole it. How long shall I give the 2 remaining Eggs to hatch