In October 2014 (less than 3 years ago) I bought a UP2414Q monitor. I've recently loaded up the service menu (Press and hold buttons 2 and 4, then 6. Then release all three buttons at the same time), which showed me a backlight on hours of 22347 on Aug 17. Repeating that on Sep 9, it read 22887.

This makes it appear as if to have been on for 22887/24 = 953.625 days, or 953.625/365.25 = 2.61 years, which is basically the duration of the ownership.

Additionally, over the course of at most 24 days, backlight has supposedly been on for 540 hours, or 540/24=22.5 full days. While my computer is on 24/7, my display does not get used more than 8h every work day, and it goes into backlight off after one minute of no use (confirmed by having the power LED switch to slowly blinking mode).

It seems likely this is a firmware bug in REV00 UP2414Q — has anyone else with UP2414Q seen this?  Can you check to see what your backlight on hours are?