Leda% works well as a speedrun because nowhere along the way are you, waiting for something like the "boss at 25 minutes". It can definitely be pushed under an hour, around 55 minutes if optimized maybe a little less I wouldn't be able to say for sure.

Reach level 20 on mad forest

Reach level 40 on inlaid library

Reach level 60 on Dairy Plant - I've unlocked Poppea for her speed and song of mana, which is probably worth whatever time loss it creates reaching level 60 since it's a long walk to the bottom of Gallo Tower

Kill Leda in Gallo Tower - Thousand edge probably needs to be the priority. Wings obviously help with time. King bible with duplicator helps keep you safe so you can stand still and unload on Leda.

It's a pretty approachable run that isn't a huge time investment and ends with one of the cooler, adventure/boss type secrets. And there's lots of room for variances in people's time especially in Gallo Tower. I wanted something quicker than any% and since you don't need the yellow sign to unlock Leda this ends up working well. Maybe it doesn't go on the leaderboard but thought I'd share for anyone looking for something that plays more like a "main category" but shorter than the existing ones.