I don't know. I've never timed it. But she spends a little bit of time in the Excersaucer in the morning between when Papa leaves for work and I'm done with washing up. She spends a little non-eating time in the high chair when I'm doing things in the kitchen that would be dangerous to have her on me, or on the floor. She spends a little time in the Bumbo seat during the day, but one of her current favorite activities involves pulling things out of a basket of toys in front of the Bumbo...she spent an hour doing this a few weeks ago; I expected somewhere between ten and twenty minutes depending on how many things she felt like pulling out-I'd put her in there, knowing I needed about an hour to do something, and figured that when she had had enough of that, I'd give her something else to do. And she fussed when I took her away after twenty minutes so I put her back.
She has a crib and spends a few minutes in the crib during the day here and there, too-it's where I put her when I need to rinse a diaper, or use the bathroom without the company of a seven and a half month old.
I tend to follow her cues with what she wants in this regard just like with other things. When people ask what baby essentials are, I will tell them "a safe place to put the baby when you need two hands and wearing the baby isn't safe or possible" and that's what I treat those things as...a safe place to put her when I need two hands.