That is the time a plant grows during the pre-flower stage usually 1-2 weeks long - a plant can double in size during that period of growth , next comes flower stage (1-3 months)
It's a good plant. Haven't grown it. Have smoked a winning cut of it - very good quality. Didn't exactly stand out for me, but it does for others so your mileage may vary a bit. Still thought it was good none the less.