A little over 4 weeks and can say that I've been impressed by how my girls responded. They've all showed signs of flowering being days apart from germination. The samples one which is the right white bucket is flowering before even being 4 weeks old. So this Alaskan Purple Auto is looking good so far. Running 2 300Watt Led along with double panels about 50 Watts a piece along with a direct small leds to give some more direct light sources. Going to probably buy another 300 watt led to compliment one another. I believe these lights can be enough but I like to play safe.