I wouldnt think so, lift the cotton wool and have a look to see how white or yellow its turning,as said earlier paint it on with a brush works very well....
I use stronger peroxide so might be wrong with this, but I think 4-6h should be enough. I personally dont like too white heads as I think the bone does not look natural. I often use 30% peroxide and it is enough just to brush with peroxide clean wet skull, making sure you cover all places, and leave it to dry. You could repeat the process, but it is usually not neccessary.
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