Changed lights to 12/12 When will i see flowering occur?

How many days after changing lights to 12/12 will you start to see changes in your plant?

About 10 days; more or less. That is if plants are mature enough to bloom in the first place. Flipping too early delays flowering. The boys usually show up first.

I vegged 35 days, day 12 I saw first signs of bud forming. Richard is spot on.

It's easy to get used to explosive veg growth and anticipate that in flower but it's different. It's almost boring if you ask me but the buds growing and stretch make up for it. Just have to be patient.

Yep, agree. I've got one going now, and it was about 2 weeks before I was positive it was female.