I really dislike the word "burnout" for the feeling of being done with a video game. It's totally normal to feel done with something after spending a long period of time with it. Especially with a game that you can put hundreds of hours in.
That being said, I haven't experienced the feeling of being done with ACNH because I haven't completed things. But I also restarted my island within the current year and basically played a year really quickly with time traveling. I have felt tired of it and I haven't been playing it much in favor of other games. I know I'll be beck into more intense play eventually, so I'm fine with taking a break. At least my villagers won't move out on me like in New Leaf.
TLDR: It is ok to drop a video game if you aren't having fun with it anymore. It doesn't matter of you have played it for 1k hours or 5 minutes.
Off topic side note: I learned the definition of burnout as a severe medical condition that can plague people with intense emotional jobs like doctors, nurses, and teachers. So that's why I don't like it being used to describe with the feeling of being done with a video game. However, I am also very aware that I am one of the very few people who has an issue with that. I just have to get it off my chest every once in a while.
That being said, I haven't experienced the feeling of being done with ACNH because I haven't completed things. But I also restarted my island within the current year and basically played a year really quickly with time traveling. I have felt tired of it and I haven't been playing it much in favor of other games. I know I'll be beck into more intense play eventually, so I'm fine with taking a break. At least my villagers won't move out on me like in New Leaf.
TLDR: It is ok to drop a video game if you aren't having fun with it anymore. It doesn't matter of you have played it for 1k hours or 5 minutes.