This game has a hard mode on N64, but I'd don't see the category here. I did a live stream of this here:

At 8hr 22min 03sec in the video, the in game end timer shows: 5hr 4min 10sec.

I start the game at 10 minutes and 24 seconds, and end the game at 8hr 17min 02sec. So if I'm doing the math properly the real-time time is: 8hr 6min 38sec.

I don't know if this is the right place to request this, if not I'd like to know.