long hair
5-15 min
no, it won't bleach your hair but it will dry it out!
If toner is not left in the hair long enough, it will not work as promised.
It is practically impossible. You have to have roots to bleach your hair and root on hair of at least a inch or more to safely bleach them. You don't want bleach directly on your scalp.
3hours
Usually, any time after. But you should check the dye and bleach boxes just incase. If you can bleach your hair after, just make sure your hair can handle all of the chemicals.
Depends on the bleach, how much colour is on the hair etc. Probably around 40 minutes, you will probably need to tone the highlights and you'll DEFINITELY need to keep checking. For a caramel you should lift your hair to an orange-yellow colour, then tone.
When you bleach your hair, you are stripping all color pigment from your hair. You will need to wait for new hair to grow back for your hair to return to normal.
It will not hurt as long as it is on the hair. You should not touch the scalp or your hands with it as it will burn and you should never use household bleach because your hair will dissolve in it.
Hair bleach does not stay active for very long once it has been mixed. It begins to lose strength quickly and should be used within an hour.
Around 25 Years.