Food used: Adeptus' Temptation + "Pour la Justice". Without food, it would take around 1:25 ~ 1:30.
From what my friends tested, Bennett + Fischl probably would work better. But I couldn't be bothered to think of a rotation that would get around Bennett burning the boss off, so I just stick to this ¯\_(ツ)_/¯.
BGM:
• ASGORE THE SHOGUN OF THE MOUNTAIN