Hey there astroworld, you can top a plant anytime after it gets her fifth node, so right now you're already good to go. You can top anywhere above the third node so just clip the top or clip the very top right now. Now to answer your question, what really matters is how you've planned your grow : a medium veg is 6 to 8 weeks and topping strategically will either produce four mains (if you veg out longer a top at the fifth node) or two mains, if you top now. End of the day it's grower preference, but you're good to go ! 🚀