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You need at least 6 weeks for the seeds to mature. So the ideal time to pollinate would be day 20-30 of flower. :)

The above female is my auto, and used as an example of white pistols. But I would suspect they are still in a good window to pollinate. But the seeds then would be semi auto. Meaning some seeds would be photo, and some auto.

Oh I thought you meant "fully" as in until they are fully matured (nearing harvest). You just meant once the flowers are full grown. :)

Interesting info! Some day I will try this...