I lean towards the status quo of one day interviews. But I liked how you considered probably of success as a consideration.
Consider also that: 1-((1-.7)*3) = .97
3 interviews with a 70% chance give you a 97% chance of landing atleast one job. More interviews improve your situation rapidly. Job hunting is better seen as a campaign than individual battles.
But I also think maybe in my estimation you FAANG chances aren't that low as your 2%. They hire tons of people, ALL THE TIME.