How many bottles of Strawberry Leopard?

It's been a few years, and I've been very boring. I've used strawberry leopard before. Loved it. Going to buy some today to give myself a little makeover this weekend.

QUESTION: I haven't dyed my hair since it was 6+ inches shorter... How many bottles do y'all think I need for armpit length hair?

For the life of me, I can't remember how much goo I needed for my head, and I do not wanna run out halfway.