I'm using this product called Color Charm (Wella)(Extra Mild Toner). How long do I put it in my hair?

You need to have peroxide as well, no more than 20volume. It shouldn't be on your hair longer than 20 minsI'm using this product called Color Charm (Wella)(Extra Mild Toner). How long do I put it in my hair?
Don't it come with instructions???????I'm using this product called Color Charm (Wella)(Extra Mild Toner). How long do I put it in my hair?
what are you covering with your toner??? If its a bleach 15 mins should be enough but if its darker go for half an hour...