EDIT: The sequel/remake is about 20 minutes, and there are several endings but you can play once if you want to. I made a game called My Dear Kitsune (bait and switch nightmare fuel game, so there's a violence warning.) It starts out looking like a children's life simulator and turns scary a bit of time through: play it here.
Edit: the sequel/remake is out, and it's only about 15 minutes with the ending that takes the longest to get (the game has multiple endings but you can play it only once if you want). Play the game here.