Actually these are the mesh point APs and thus giving me a tough time. Its taking over 15 mins for few of the APs.
My bad that I copied and pasted the tech-support for a bunch of APs on the controller, assuming it would happen as quickly as I had observed in Campus APs.
Really appreciate your responses.
Would had been greatly handy if the auto paste of "tech-support" for the very next AP in succession be stopped from Controller :(