I mean considering someone like me, who doesnt have much to sac, nor souls to open, and relies mainly on grand sac and luck eith 4 stars to continue...
Hell, As many Rainmakers as I pull, I could probably be able to do this in a few months. You would need 330 skill shards as well but with these crazy...
FWIW: You can do 100K in one sacrifice. I do wonder if you can do 150K in one sacrifice tho. Probably if most of the characters are sharded you could...