LOTS. I can stand LOTS of "at home" time. There is really only ONE thing I *like* to leave my house for: tennis. I DO leave my house, obviously. I go out a lot. But given the choice, I'd stay home. I love my house, I'm about as homebody-ish as someone can be. I don't know what if feels like to "be itching to go out". I simply can't relate.
My husband likes staying home, too, but sometimes he says "let's DO something". Which is fine with me, but then he wants me to plan it. No thanks. I don't want to "do something" that badly.
Interestingly, we never argue over this, though. He says "Let's DO something." I say "Nah, but you go ahead." He says "Well, I'm kinda tired, actually." or "Some buddies of mine are meeting at a bar. Think I'll go see them." Either way, I get to stay home, he gets to do what he wants to do. We're pretty amicable about this.