lol…. Depends how you look at it … seedling , early , mid , late ….each stage can be a two week growth … so seedling be your 1st set of leaves , true leaves … early can be up to the 4 th set of leafs , mid be 4th set to six / 7th set, late can be 7th set till you start flower , depends how there eating can be adding an extra 5 ml in late veg , it all depends how you do it …. Can run a late veg for a week then flip , not set rules … or you can do a early feed , 1 week of mid , 1 week of late veg feed and flip 12/12 … the feed schedule is built for as many weeks as you want , not like flower where timing is everything .