You should wait till its slightly root bound, then into a bigger pot, wait till its root bound there and once more into a 5gallon bucket. That will give you 3 different tiers of roots to give it lots of support and let it grow big.
Take a clone and grow it in a 5gal pot, then take one of the same clones and start it in a small pot, transplant to a slightly larger one, then again finally ending in the 5gal and that plant will get way bigger than the one that can just grow its roots uninterrupted fro the get go, its good for them.