If you want to clone your clones, you will have to wait until there is sufficient new growth to be taken as a clone.
This can be anywhere from 2-8 weeks after the original clones take root and start growing independently and depends on many factors - strain of cannabis, growing technique and conditions, plant vigour, lighting, nutrition and resilience of the clones, being some of the factors influencing this time line.
There is no, one single answer to this question, it will all depend on YOUR plants in YOUR conditions.
Hope this helps,.......
Organoman.