It needs at least 21 days in veg before it will start flowering. Everyone has different goals for their plant in what they want out of it. I personally like to aim for 30-40 days in veg and then i'll flip to flower. I grow small to medium sized plants so a shorter veg time works for me. You may want to veg it longer depending on space size or if you're aiming for a certain yield.
When flipping photoperiod plants to flowering, the plant will still continue growing upward for roughly 14-21 days depending on genetics - some even a bit longer. After it's done that "stretching period", it will focus on flower production.
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It needs at least 21 days in veg before it will start flowering. Everyone has different goals for their plant in what they want out of it. I personally like to aim for 30-40 days in veg and then i'll flip to flower. I grow small to medium sized plants so a shorter veg time works for me. You may want to veg it longer depending on space size or if you're aiming for a certain yield.