Fast stretching?

im exactly 48 hours into flower at 12/12 and my plant has grown an immense amount.

Day before I switch to flower plant was just over 12 in now 2 days later I’m almost at 16 in.

Is this normal?

600w HPS
Coco

Buddy some strains tripple in size by the end of flower lol. Its normal

I'm 7 days into flower and some of my plants grew 4-6 inches just in 8 hours last night. You need to make sure you plant for the stretch if you don't have ceiling height.

Completely normal. I am in the first stages of transitioning to flower and I am seeing an explosion of growth!