It might take three to four months for Dreads to Lock up 'all the way'. You should have some shrinkage and tighten in about eight weeks if your maintenance care is adequate. But remember it depends on your hair type and what condition your hair is in.
1 Additional Answer
The length of time it would take dreads to lock depends on the person, but the average amount is months or even a year, which is rear. I would advise for you to have a professional put in your dreads; they will lock faster.
Dreadlocks, also called locks, dreads, or Jata (Hindi), are coils of hair. Most dreadlocks are usually intentionally formed; because of the variety of different hair textures, various methods are used...