The lifespan of an LED lamp depends on the number of hours it is used and varies by lamp type. On average, LED lamps last between 15,000 and 50,000 hours, which is significantly longer than traditional incandescent bulbs.
LEDs last so long because they produce very little heat and do not have fragile filaments. For each product, you can check the specifications to see exactly how many hours of use the lamp is rated for, so you know what to expect.