I recently discovered that WF is kinda buggy somehow. I end up getting way more than +4 secs per kill. I think I pinged @Elric Galad if he could look into it as part of his mechanics deep dives/modding, don't know if he ever got around to it.   It was remarkable enough that I changed my recommendation about it in my guide, for single-class it's a great way to extend your duration since it's pretty hard to do so otherwise (versus a multi-class). The extra aoe becomes a nice cherry on th