my first run was like 45 minutes and it was like 2 months after 6th job came out and i maxed origin
for p3 you just have to slow way way down, its a patience test, you have a whole hour to fight him so what you gotta do is burst when its safe and then just try not to take curse deaths when its not safe
he does the kick (looks like a slap animation) every 4 seconds and if you get hit with it you get white cursed and probably knocked back into a laser which is -1 life so if you dodge anything in p3 make it this attack, up/down fma isnt that bad