I wish more of the sad sufferers of "display paranoia" would internalize this paragraph.
I have it on good authority that Apple will replace a defective display, whether those defects appear immediately, or over time. Where is the sense in deliberately trying to force a display to exhibit problems??
"Well, it doesn't seem to have IR after 10 minutes of this checkerboard test, but how about 30 minutes? Still no? Maybe I'd better just leave it on like this all day just to be sure..."
Honestly, I find this IR "witch hunt" totally ludicrous. Why torture yourself with this stuff? If it becomes a problem during normal use--as it did for many early adopters of the retina MBP--then just take your computer in and have Apple replace the display. Because if you intentionally try to "break" your display by subjecting it to totally unrealistic usage scenarios, the odds are very good you will succeed.