Definitely. Are they from seed or clone? Soil or Hydro?
The longer you veg, the larger and stronger the plant will become, and it will be better able to produce bud. Longer veg times also allow you to train your plant, using LST, Supercropping or Topping. Doing this will increase the number of growth sites for bud later on.
Bear in mind that they will likely double in size after you flip to 12/12, so if you don't have much vertical room in your grow space you may want to flip them earlier.