the words fast and dreadlocks usually do not appear together... So to answer your question... It is going to take lots of time. Patience is the one thing all successful dreadheads have learned through their experience.
what goatboy said...you can make em look nice and fat to start with (through backcombing) but then the get flattened and get a bit thinner... BUT over time they start to shrink and get fatter...depending on how big each section is ofc
