18 Week Old Pullets | Mixed Breeds | Laying Age Question

[Butt_Nugget_Hut092]

Hi,
So I was hoping someone could give me an estimated time frame in which these chicken breeds start laying. I know the general rule that is seen most often is between 18 to 24 weeks, but that's not a true statement for different breeds of chicken. Various breeds have different time frames. So here is my list of chickens:

• Starlight Green Egger
• Prairie Bluebell Egger
• Olive Egger
• Sapphire Olive Egger
• French Black Maran
• Ameraucana
• Midnight Majesty Maran

This is my first time owning these breeds of chicken. My usual is Barred Rock chickens and I know the time frame in which they normally start to lay.
Any help or information would be appreciated!
Thank you!