I have 3 bulbs. One came with a little plant which broke off and is alive, but slow growing (very shaded though). A second bulb sprouted, I cut the lilly off (also stalled at the moment), and the bulb seems to be growing 2-3 plants right now. The 3rd bulb just sprouted and toor node is throuwing down a few roots and a few small leaves.
So, it seems the bulb will keep on growing plants until it's all used up.