How long does my hair have to be to start dreads with this method?

You should probably have at least 6 inches of hair and no more than 12 inches.

Backcombing is probably the fastest way to get permanent dreads. Because the hair looks like dreads right after they are finished, there is also an estimated time of 3 months to lock up. This is the least amount of time out of all the methods.

The fastest way to get temporary dreads is probably the loomed dreads method. But you can only leave them in for a few days. So if your going with temporary dreads use the silky dread method.

Not really, but if you are choosing this method you probably don't care about length because you loose about 50% of your length dreading with this method.

Not really, but if you are choosing this method you probably don't care about length because you loose about 50% of your length dreading with this method.

This method will work on Caucasian hair if it is very thin or curly. Straight hair usually doesn't stay knotted up and thick hair has a hard time staying in knots.