I bleached my hair from cherry black to ginger.... I want to go blonde... how many bleachings will it take?

if it's ginger now and not in too bad condition, bleach it again and use silver toner on it to get it a less brassy colour. if your hair is in bad condition from the bleach, use a conditioning mask until it's better before you bleach it next. if it's not very ginger now, more like an orangey blonde, just use the toner now. you can also use silver shampoo if you can't get hold of toner.