Seed maturity

hello. i had a snow white female get pollinated and shes showing green healthy seeds growing right now. shes in 9th week of flower, i have cut down the top half of the plant and im letting the bottom portion go where the pollinated flowers are.

my question is, once the green seeds show up growing in the flowers, how long will it take to have completely mature seeds? i want to take her down and put a different one in her place but i really want there seeds. thanks if u know
 
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