The life of a led light depends on the quality of the light and how often it is used. The better the quality, the more likely it is that they will not become dull. It can be as long as 3 years for some of the best quality lights.
LEDs do not need to be replaced like other light bulbs because they last a lot longer. LEDs can last 10 times longer than a regular light bulb. They also produce a brighter light without needing a dimmer switch.
The main reason LEDs don’t need replacing is because they have very low power consumption and produce the same level of brightness for their entire lifespan, meaning that they will never get dull or less effective.
The lifespan of LED lights is usually between 50,000-100,000 hours due to their fast degradation. The bulbs are prone to getting hot and the heat will shorten the lifespan of the bulb. The heat gradually converts the phosphor coating on the inside of the bulb into a different form that doesn't emit light as well.