Because LED lighting is electronics it hates heat, unlike an incandescent lamp. So the most common cause of shorter lifetimes is that the LED can't discard enough heat to the environment and begins to overheat. Small (or absent) heatsinks, installation which (perhaps for aesthetic reasons) puts the lighting where warm air can't escape and of course just putting the lighting directly in concentrated sunlight will make this worse.

I have a room which is lit for like 10-20 hours per day and so it clocks up hours very quickly and my LED lamps are guaranteed for 2 years so I figured surely the guarantee would trigger but nope, I began keeping receipts and turns out that I only need to replace one every 3-5 years it must just feel frequent because it's annoying, I just dug out the most recent receipt and it's from 2021. I will continue keeping the receipts to feel better about the annoyance.