Some male birds will remain hormonal for a long time....I would think he should be starting to wind it down though.Keep lots of destroy able things for him to tear apart to wear off the hormonal rage.If he is unable to mate..the hormones can't really settle out of his system.If you can let him shred paper,wood,phone books ,whatever it can help distract him from the natural hormonal cycle.Forgive my short memory...is he the only bird you have? The hormones could stay active longer if there is a female bird close to him.You could also experiment a bit with a product like a I calm...I'm not sure it would reduce the hormones..but may relax the urge a bit....