I haven't yet tested these potions but have to wonder how they work. Both Illusion and Alteration have potions that increase the duration 100% for 60 seconds. That sounds good except most of my illusion and alteration spells which are not per second are for 60 secs. Every Alteration spell is for 60 secs (or per sec). Some lower level Illusion Spells are for only 30 sec but the higher ones are also 60 secs. I really don't understand the percent extension for a set time. If it made it stronger, say a frenzy worked against a stronger enemy or a flesh worked for longer, those would be useful but these don't seem so. What am I missing? How do you extend something 100% for 60 secs?