Tasha, I would add a bit of shading around all the advice you've gotten here. To be clear we are talking about mature adults, not puberty.
What's not noted here is that ekkies are a bit Unique. They don't have a defined "breeding season". As such they come in and out of major or minor bouts that have varying durations throughout the year.
I've never had Parker stay in a hormonal state for more than 2-3 weeks, and haven't known anyone to be in a hormonal state for a month. His bouts come and go, sometimes they are barely a blip lasting a couple days at most with barely perceptible behavioral change, only noticing by someone who knows him. Sometimes it's full on aggression and masturbation.
Like Stephen noted, it's a ramp up and ramp down. For worst case scenarios, the ramp up lasts maybe a week or so, the full force lasts just a few days to a week at most, and the ramp down about a week, maybe less.
You're mileage may vary. As lordtriggs pointed out, some birds never really become hormonal, others manifest it often. Parker for a while was on a 6 week cycle. Now he's just wildly unpredictable. He just went through an aggressive phase that lasted a couple weeks, and calmed down. As soon as that cooled down, a week later he started masturbaing on a few perches several times a day, and he's still on it.
So with ekkies more so than other birds, ownership is like a box of chocolates, you're going to get it all. You just don't know what you'll eat, and when.
