is it okay if plant gets 18 hours dark?

switching to 12 12 from 18 6, wanted to change it so its not on during the day so that people dont suspect shit, but is it okay if i leave it off 18 hours so I can fix the schedule

tl;dr: ok to get 18 hours of dark when changing to 12 12

will it stress it hard or hermie it? dont want a hermie:joint:
 
Alright, decided to leave in dark for 24 hours, better than fucking everything up.

Just is it okay if they were under the less bright cfls for 10 minutes? I heard other lights can fuck them up.
 
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