average time for pistel transition?

Wondering how long does it take on average for a plant to finish after the transition of pistel color begins? Bonus questions, purple calysts? Is that normal? 67 for temp start to finish, I know cold temps can make plants darker 67 isn't too far off to make them do that. So how about the time for your guys strains if I get enough people to answer I can find the average myself. I'd like if you could narrow it down to a secific amount of days then weeks. Thanks again and sorry for being unclear. I do understand that all strains vary, but I'm trying to write a walk thru of growing for a friend and this is something I'd like to put in there. Maybe I'm just lifted and weird but please answer if ur able :)
 
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