As we all know http://ask-vexin.tumblr.com/ loves to test her potions and the red anthro potion is her bestseller, so nopony would wonder that she makes especially hard tests on that one.

http://koorirandom.tumblr.com/ modpony of http://ask-frost-and-snowy.tumblr.com/ volunteered this time for an extreme stress test. I think they were testing if a high amount of endorphines and adrenaline has an effect on the duration of the potion.

I bet 3 hours of testing gave some valuable results for Vexin.