You guys on this side of the pond seem to be obsessed with running in!!
Just get it out the box, calibrate it and enjoy for christsakes!!
I got my 9G out and played singstar for 5 hours that night, then went to bed drunk and left it on, so it was sat on the menu for a good 12 hours solid, slight IR that was gone after watching another channel for 2 minutes.
That was with the contrast on 38 in pure mode, so not exactly taking it easy with a brand new set.
I agree the set changes over the first few hundred hours, gets sharper and sharper and looses that nasty digitalness they have out the box, I tweak the setting at around 250 hours and then again at about 6-700 hours, but I don't worry about IR.
Done the same with all my sets, only one I ever had a problem with was an NEC XM3 and the Pioneer 436, but they were crap and gave me a good excuse to dump them anyway.