In addition to what direct no speed said, it takes usually a little over 3 months of training on the job to check out in the ACC in Abu Dhabi. There have been a number of expat controllers who have not made it here, usually due to a lack of sequencing skills as that is a huge part of the job in area control here with about 80% of our traffic landing or departing from within the UAE. Most though get through. As Dr Evil said there are heaps of threads on this so do a search.