This question is totally dependent on how do you use the projector yourself. In general, the projector is bound to last for a long time. But this lifespan can be affected if and when like any other electronic device due to overheating, rough use and even in case of dust which can settle onto the gadget. But in case of a projector, it's not just the body of the projector at risk. It is also the bulb which works to project content onto the screens for you. This bulb depending on the device has a fixed number of uses before it can fuse. Although in the case of the fused bulb, this can be replaced. And no need to panic as you wouldn't have to replace the whole device.