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Light schedule question

Hi. I have 3 autos in flower under 18/6 and one photo that i have been removing and placing in dark so its 13 dark 11 lit. Tomorrow i will be unable to remove it at the normal time. Should I leave it under 18 hrs of light for one day or extend the night hours. Which option would be least likely to interfere with the flower creation? Does one night of extra light even matter? She is about 3 weeks into flower and is filling in nicely. Thanks.
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