Mango after more than 3 years won't come to me, won't eat from my hand, etc. He had hard past, forgive him.
Coconut is tamed: he will step up, eat from my hand, never land on my shoulder but instead fly so close that I'm afraid he'll hit me one day. Never happened so far! Sometimes he forgets that he can trust me and he is like Mango- only sometimes. I don't know how long it took me to teach him. From what I remember, he was easy to teach from the beginning. Second or third day with us he eat from my hand.
Lemonade (female, who passed out last year) was so-so tamed. By that I mean she would step up when she wanted. When she mature and became Mango's girlfriend, she didn't want to listen. We're joking that it was Mango's influence on her
Blueberra - our female - similar story as Lemonade, only she remembers sometimes what is to eat millet from my hand.
Plum is tamed, sometimes he doesn't want to obey, but only sometimes-similar as Coconut. Plum is under Mango's care right now.
By "tame" in budgie world I mean only that they are not wild to me, I only teach them basic: "Step up", "Come here", "Sing to me", "I have a something for you".
I don't know if that's only my experience or coincidence, but male budgies seem to learn faster and remember later those basics.
Good luck!