This was for the official walkthrough of the game. Cropped the ending, so it doesn't actually show the time. Take the RTA if you'd like, since IGT ending isn't shown. Sorry; this website didn't exist when the video was made.

edit: the video does show the IGT of 24:45 before entering the final room and finishing the game, as a reference... could RTA from there if you won't take the 25:25 that I'm stating it was?