Why not simply ask why he shoud wait an hour instead of making stupid remarks ?
Stupid remarks... 3 letters can already set you off?!? Well, perhaps because I had some idea it had to be something weird, and this time it's about RAM chips needing an hour before they start forgetting whatever they were doing, which is not a thing at all for RPi devices.
Maybe there are some RAM-Chips build inside the TV and/or the Raspberry which stores some Data (Settings) as long as they connected to Power, like the Chips you use as RAM on your Computer.
"Maybe"..? Please don't start making things up along the way again. Why would that be helpful?
Really, a modern LED TV and the RPi are not 70-80's television sets with light bulbs that have up to 25,000 volts on their tubes. The RPi has a modern design. It really does go into Alzheimer mode in under 3 seconds after the power has been cut off.
Helping out people on a forum really is fine, but giving out dis-information is not helpful. I actually don't know everything about LibreELEC or computers, but I'll join in when I have something on Kodi which I know is correct.