Indoor cultivators can grow autoflower seeds from seed to harvest under 20 hours of daily light. Seedling 20 hours of light, 4 hours of darkness 20 4 Vegetative phase 18 6 Flowering phase 12 12. Are you aged 21 or over.  Source: <a href=https://koreanstudies.com/forum/viewtopic.php?t=941>https://koreanstudies.com/forum/viewtopic.php?t=941</a>