There are lots different types of ways to get dreads but i used the backcombing method...
The time it takes really depends on how long and thick your hair is. The first time i got dreads i had hair a little more then halfway down my back and it took about 8 hours with 2 people working on it at the same time.
the second time when my hair was right above my shoulders it took about 4 hours with one person working on it and taking breaks every now and then.
once you have made all your dreads just sit back, relax and never brush your hair again!
they are going to unravel in the beginning but they will knot back up in time. Make sure you remember to use residue-free shampoo and NO CONDITIONER.
A lot of people think you have to use wax to have good looking dreads but this is NOT TRUE. Wax gets all built up inside the dread and will most likely never come out. plus, it makes your dreads look oily and gross.
If you want to keep your dreads tidy looking and round you can roll aloe into them and palm roll them alot.
apple cider vinegar is a really great thing to use to deep clean your dreads everynow and then.
so, i think thats about all you need to know when you have dreads...hopefully it helps!
What you do to start is wash your hair with non-residue shampoo (you have to use that kid of shampoo when you have dreads because if you don't they will get all this sick build up and grow mold and it just gets horrible.)
Once its dry you can section your hair or just grab random chunks, it just depends on how many dreads you want and what sizes you want them to be.
To start backcombing: Hold the chunk of hair in one hand and with the other hand start combing upward starting at the roots and moving down to the tips when you think the roots are tight enough. Turn the hair every now and then so the dread will be round. Keep Combing upwards untill the whole chunk is knotted enough to stay in the shape of a dread.