^Guaranteed? 90 days. [Like with any light bulb , you never know for sure, you only know statistically what's likely.]
Most likely until the "Replace Lamp" suggestion comes on? A little over 2000hrs. [Your likelihood of popping the bulb, which is potentially dangerous for the product, starts to grow significantly after that, I guess.]
If you run it on Eco mode (dimmed) with High fan speed (called "high altitude in some years) around 3000 hrs. [although in some earlier Panny pjs of the past, they even claimed 5000 hrs, for a short while, but then retracted that claim and said merely "We don't know for sure"]
In A/V reproduction accuracy, there IS no concept of "accounting for personal taste/preference". As art consumers we don't "pick" the level of bass, nor the tint/brightness of a scene's sky, any more than we pick the ending of a novel or Mona Lisa's type of smile. "High fidelity" means "high truthfulness", faithful to the original artist's intent: an unmodified, neutral, accurate copy of the original master, ideally being exact and with no discernable alterations, aka "transparency".