Hi
@happytimes! Well, the longer the better, more veg means more yield, especially if you have a plan in mind, like Scrog or Mainlining. Those approaches take several weeks of veg but patience is rewarded with big yields. Usually growers determine the veg time by thinking of their available height: you can keep the plant in veg stage until half of the total height is filled (40%~60% depending on the strain, check your breeder's recommendations about the stretch). This way, your plant won't exceed the available height and you'll use 100% of your room's capacity. Hope this will help, keep us up-to-date and happy growing 👊