12 hours of light and 12 hours of darkness. 12/12 is the standard cycle for flowering Cannabis plants indoors.
If you extend the light period by an hour or two (13/11 to 14/10) you can correspondingly extend the flowering period by 10 to 15%. There is an added bulk that makes up for the extended time but the buds may be a bit leafier.
Any attempts to use a cycle that does not add up to 24 hours should be considered very experimental as it goes against the natural rhythm that all living things have evolved with.
Some equatorial based varieties may not be light cycle triggered at all. This means that they are used to growing under 12/12 all the time and will flower (and finish) when they are good and ready.
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