Given the size, and its appearance. It looks like you may have another 1.5 months to go at minimum, and greater due to non-ideal enviornment controls. Some of the challenges outside of planter size, it seems insufficient lighting and inconsistent watering, by the stetch and clustering of leaves. Some strains may look like this, particularly SFV or some Diesels. They will be light on stem/leaf growth initially, and grow an abundance of branches and leaves in during flower.
Initially, I was thinking this was a re-plant of a broken branch. You can still salvage this plant for next grow, by letting it go through a cycle. I've taken broken branches and re-planted, added N, and 18+ day light to re-veg.