Though often used interchangeably, "image retention" and "burn-in" are not the same thing. Image retention is temporary: It goes away in time. Burn-in is permanent: It does not go away.

Can image retention be permanent?

Image Retention: When a static image is left frozen on a display for several hours, a faint imprint of the image, known as image retention, can remain. This image retention may be temporary or permanent. ... On today's plasma displays, permanent image retention is less of a worry.

How long does image retention last OLED?

It can be run manually if you notice image retention or, in the case of LG, you'll get a reminder to run it after 2,000 hours. LG also has a Daily Pixel Refresher, which it says "automatically operates when users turn off the TV after watching it for more than four hours in total.