From Ilovegrowingmarijuana.com, FWIW


Dark cycle interrupted

Problem: The lights were left on for one or more days.
Symptoms: If the light is only left on for a single day, you wonâ??t really see much difference. But, if the lights are left on for a few days straight, the plants might start regressing back to vegetative growth during the early stages of flowering. Too much light exposure has less effect as the plants near maturity.
Solution: Get the cycle back to normal as soon as possible. This will prevent the plants from incurring any more damage. If the plants have reverted even a little bit to vegetative growth, the buds will obviously take a little longer to reach full maturity.

Problem: The lights were left off for one or more days.
Symptoms: Buds will ripen faster.
Solution: Simply turn the lights back on an continue the normal flowering schedule until the buds are ripe.

Problem: The lights were turned off and on irregularly.
Symptoms: Youâ??ll find lanky, irregular buds and an increased probability of hermaphroditism. See Hermaphroditism for more information.
Solution: Use a timer to ensure that the light regimen remains consistent and helps the buds grow and gain potency.