Depends on how big they are, and how nutrient-rich the soil they're in is. If they're starving for some nutes right now then you will probably see an explosion of growth in the next few days. If they're plenty green before you fed them and they're in some rich soil then you wont see too much more growth than usual.
Well they're about two weeks old I pile soil around the stem when it grow so I'm not sure how tall they are.