My suggestion is to have tooltips on potions and useable items (and heck, everything in general) make sense. Don’t use percentages or decimals in some strange math calculation we need to break out the abacuses for.
Case in point, the Weak Honing Stone
It says in the tooltip that it 'Increases weapon damage by 200% for 0.03 minutes"
How long is 0.03 minutes? I don’t see that on the clock. I have to bring out a calculator and in my rusty math I learned 40 years ago, come out with 1.8
So why can’t you just say it ‘increases weapon damage by 200% for 1.8 minutes’ Or round it up to 2 minutes?
Make things easier for your players so they can enjoy things.