Wow, I had a scare recently on my VT60. I left Sonic AllStars Racing paused and fell asleep in my bedroom. It was on the screen for atleast 7hours.
Took half a day of running screen wipe to eliminate it but it did clear it.
As your tv gets older it will go away quicker. I left my tv on for 8 hours on a static screen a week ago and the IR was gone after an hour or so of normal viewing. I have a vt25.