What size/age to start selling hatchlings?

[C&H Exotic Morphs]

K, I have browsed thru several pages of post and tried the search feature but haven't been able to find the answer to my question.
So I figured I would ask for others input and opinions.
At what size/age do you start offering your hatchling Leo's for sale?

[JaGv]

after their 1st couple of meals

EDIT:oops i tought you were reffering to bps