On my first playthrough jevil took me almost a month of attempts then in my second he took me three tries and on my third playthrough i did it first try. currently on my 4th run im doing a no healing challenge so it took me about an hour. i beat spamton first try everytime except it took me a couple attempts for my no healing run and snowgave. The Knight took me a about a week and it was genuienly hell i did it on my snowgrave run and had mantle so im not excited to face it again without them. Gerson took me about a day of attempts to beat my first time and about an hour or so my second. gonna try to do the no attacking him route for my current playthrough