Honestly, I agree with Donkey Kong. Stacking up 16 minutes of Wrath potions is only worthwhile if you think you'll actually be using all 16 minutes, and you think you won't die in the meantime. Most of the time, the safer and more efficient option will be to wait until your potion runs out and use the next one then. You still need to use the same amount of potion and you still get the same maximum potion time, its just more punishing if you fail. I think this is balanced, and I support it.