Carpet pythons are slow growers. I've read of females not laying a clutch until they were 4 years old. Growth rate also has a lot to do with locality too. A Coastal could be 3.5ft - 4ft at a year old where a IJ might barely be 3ft by 2 years old for example.
If you are really considering breeding Carpets then I would recommend this book.
http://inlandreptile.com/book%20sales.html
Good luck with your search. Carpets are amazing animals.
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