Well help us out more. What does the plant look like? Are the leaves green, are there buds or flowers? If it is budding and flowering, then your plant is close to harvest. If the plant is flowered, it is possible the plant will continue to grow taller, but it should stop. If you are still in vegitation stage, then your plant will keep growing until it starts to flower. Watch out the plants get big! Give it lots of sun, water every day, and wait to see what happens.