ive got an unknown bag seed on 12/12 from start. its 15 days along now and growing famously. it is very possible to get a small yeild from a seed started on 12/12. i thought it was the way to go time wise man, but honestly my other girl i vegged for just 18 days and she is way bigger. i really do encourage you to vegg at least* 2 weeks if not more. you wont be entirely pissed at the end when you harvest. 8 weeks is a long time to grow for only an 1/4 oz ..............however if you decide to go 12/12 from seed anyway try to jam as many plants in your grow space as possible so you can have a nice mini forest of plants each yeiling an quarter.