For PLA prints I regularly pause long prints for many hours, and have a few times successfully powered down the printer during pauses.
The key to the process I use though is to use the Cool Plate with BL liquid glue for long prints that I might want to pause - this avoids the need to keep the bed heater on slow cooking the print.
I mostly press pause while a colour change is taking place, then once the printer has started to lower the nozzle temp down to 90 I manually set the target temp down to 35 using the screen on the printer,
Once the temp hits 46 or 48 the fans turn off (if you paused during a colour change).
I also manually turn off the light too.
You can power the printer down for several days at this stage for an infinite pause- but I usually don’t as the printer is pretty quiet once paused - to only way you can tell it is on is due to the extruder BL logo light staying on.
Then to restart I just set the temp back up to 220, turn the light back on, then once 220 has been reached I then hit resume.
Have done this process 20+ times successfully,
If you pause a single colour print there is more risk of the print messing up - but I haven’t had any issues. I do find though that you have to manually turn off and on the fans with a non colour change pause.
More background info here Splitting long prints into multiple sessions - using Pause