I'm NOT an UAE ACC controller but I know that between 1030-1830 UTC the UAE Central sector is combined with UAE South sector due to lack of staff. To avoid traffic/frequency overload they enforce flow control during these hours. From OMAA via G462 to BALUS typical 5 min between departures exiting OMAA CTA via NIBAX. Good luck!
Forgot to say: don\'t go mad on the OMAA tower controllers, they just follow instructions from UAE ACC...