User blog:NightChime/Buffs: 2x Max?

I just want to clear something up about the 4 buffs, since the articles say "+20%" and the game says "2x max". So you would need to cast it 5 times on a character to get the most possible benefit? Also, there's no benefit for the caster having high INT? D:

And I guess to just be super clear, it only lasts that for the duration of that floor, right?