From a fellow grower: White Widow auto seeds flowered after a month. 1 month I to growth 4inches tall and started to bud. 16 on 8 off lighting not sure why it’s flowering. I have a 8x10x8 tent use mother earth and fox farm nutes. Started in solo cup. Two weekends planted in 3 gallon bag
Autos don’t care about the light cycle and flower automatically when they are sexually matured. They generally flower at between 4 and 7 weeks of age, but we have seen extremes where they flower at 2 weeks and other the other end of the scale we have seen some flower as late as 12 weeks.