*Sigh* No one understands.
If they have Coturnix anywhere in their name then IT DOESN'T MATTER, A & M, Tuxedo, Pharoah, ARE ALL COTURNIX. THESE ARE JUST DIFFERENT COLOURS (Yes, I'm Canadian, deal with it).
I don't know why it is taking that long they should start laying at 6-8 maybe temp is too low/high or they aren't getting 14 hours of sunlight (must for breeding season), try vent sexing em and/or post pics. Also, quail should lay around 4-6 eggs a week, young ones lay more, they shouldn't be laying every single day. Have you seen any mating? Crowing?
Sorry, i typed in CAPS it just came out that way, people think just 'cause they look different (still Cots) they are different.
Also, what bedding do you have them on? (When i had em on newspaper they wouldn't lay, but i'm not sure if i had em at 14 hours or not, hmm...)
Medicated feed?
Check water contamination too.