Young plants take longer to recover from topping. In this case, you might lose 1 or 2 days. I wouldn't go much earlier than this, and I haven't seen anyone try it earlier. If you find it easier to train your plant afterwards and achieve the form you want (e.g., developing 4 main colas with fewer side branches), then it can be effective. If you made a clean cut, your plant should bounce back soon and continue growing vigorously.