We have 4 'keets & 5 parrots. It probably isn't much different than people who have several children.
Two of the 'keets (the Linnies) are former breeders and are not hand-tame. They have 1/2 of a double-wide flight cage. When I first got them, I tried to give them 'out' time, but they are terrified of being handled and got scared & scurried under furniture or behind books to hide, when out of the cage. So they stay in their cage & I talk to them as I pass & sometimes sit near them to chat. So they don't get much individual attention & I think they're grateful - they've got each other, and that seems to be enough for them. But the male has learned to talk, so I think they do like the limited interaction with me, too.
The two young budgies in the other half of the flight cage get "out to fly" time early in the morning, most mornings. They follow me to the kitchen & supervise me fixing the parrots' breakfast, sit on my head or shoulder and sing to me & otherwise enjoy themselves. But I can't trust them to be out when the big birds are out because the budgies would just get themselves into trouble! Their flight cage is in my office, where Cookie-the-cockatoo also lives right now, along with day-perches for the macaw and one of the amazons. So I slip some scrambled egg to Cookie, the cockatoo, while the little guys are out, but don't uncover his cage because I don't want budgie toes exposed to cockatoo beak!
When the budgies are back in their cage, Cookie gets uncovered & the other 4 birds (1 macaw, 2 amazons, 2 Grey) come out to their day-perches for breakfast. and I alternate attention, depending on who needs it.
For example, PaulE/yellow crowned amazon, sits on a java tree behind my chair in the living room. He often chirps softly for attention & I pick him up & hold him while watching TV or working on the computer. Goose-the-greenwing is in my office & he lets me know when he needs attention, usually by saying something. Then I visit with him and we sing and dance and talk. Or I give him a bath. And I divide time between the living room & office (which are only separated by an archway).
Kiwi-the-Panama amazon is a great conversationalist & while he doesn't crave my attention the way Goose and PaulE do, he is very interested in what I'm doing and will follow me, saying, uh-huh . . . yeah . . . little! and generally supervise what I am doing. He also sings the high notes when Goose and I are having a song fest.
Gilbert-the-Greyt requires more attention, but wants it from my husband. If he wants my attention, he will either fly to the top of the drapes or try to engage me in conversation. Usually he starts with, "What are you doing?" and when I tell him, says, "Oh" or "Seriously?"
And Cookie is still the unknown in the house (he's been here maybe 9 weeks or so), who is just starting to step-up for my husband. He is very quiet for a cockatoo, for the most part. And the one thing I learned quickly with Cookie is that if he screams, there is a reason & I really DO need to check out what is wrong. Sometimes he is hungry, sometimes he is sounding the alarm about something he sees out the window, and sometimes, he is trying to get the other birds' attention (or ours).
So in our house, I can't say that the bird gets individual time for a half hour or an hour or something like that. They get attention when they indicate they want or need it & sometimes a quick word & pet is enough, & sometimes more time is needed. But they all are perfectly capable of entertaining themselves (thanks to their prior owners - we lucked out with our 'pre-owned' friends!) & we make sure we don't ruin that good training!
I really think that it helps that they have other birds in the same room - close enough they have a flock when the humans are gone, but far enough they have personal space. I am very aware that both Goose and PaulE claim me as their own, so I try to make sure they both get the attention they need, but not in a competitive situation. Our flock are flighted (except Cookie, who was clipped before arriving here) and there is enough space between them that they don't feel the need to defend their territories. I think the space is crucial, too.
Just like kids, it is a juggling act. But I feel like in the greater scheme of things, our birds are satisfied with the amount of companionship they get, both from us & from each other.
The reality, not your ideal. 
I don't need that mess to clean up) They'll come out, I'll share some of what I have with them, they'll go back in their cages and get their breakfast and fresh water, I'll leave and go to class for a couple hours, come home and do some readings/papers/homework (with them put away or else they'll eat my school work), spend more time with them, go to work most days 3-10, come home, spend some time with them, and then it's beddy bye time.
), speech lessons (or not :52
, walking around the house doing things together.
) and serve warm dinner at 5:30PM to them AND my dogs, lol.
