Servus Bertl,
Depending on the strain!
What is it? Auto or fem? You can keep Feminized plants theoretically forever in Veg.
So you would be free to top her whenever you want. If it's an Auto you are 2 late... due to the limited lifespan of an auto, it wouldn't work.
Good luck and happy trails for the rest of the way 🤞
Servus
OimRausch