Rooms don't get messy on their own or quickly - it takes time to pull out every single toy you own LOL!
Yeah, slightly less than 5 minutes lol ... and that includes tracking most of them out into the lounge

I've had arguments with my daughter on how to STOP her cleaning. She does it compulsively (or did until I started paying her to clean since she does it anyway). Everything has to be lined up, colour coordinated. Except paper - paper just gets shoved in her desk drawers. Her room has been quite spooky looking since she got rid of all her toys that aren't white.

On the odd occasion her room or the lounge gets so bad I need to stand over her and crack the whip, what works is breaking it down into small tasks. For all that she likes to clean, she does it in the least efficient way possible and that drives me up the wall. I need to tell her to pick up all the books first, THEN the blocks, THEN the fluffy toys etc, otherwise she'll take 1 each of 5 things and carry them around the house (passing places where things she is holding belong) with her several times while she puts them all away. It takes her about an hour to clean the loungeroom if she is left alone. It takes me less than 5 minutes, and I can't really bend over.

Funny thing is she can clean her own room in less than 5 minutes and it looks pretty good in there, but she has almost no toys, it is just clothes and paper. Shove clothes in wash basket, shove paper in desk. Done. I suppose there are advantages to having a child that has never really played with toys ...

Edit: 2.5yo is the one who tracks millions of toys around the house and plays with them everywhere. 9.5yo owns about a dozen white fluffy toys that live on her bed and quite a collection of silver/white/crystal ornaments, but no other toys to speak of.