How long can you go without social interaction?
Weeks, but it doesn't mean I weather it well. I become all kinds of a mess without social interaction for a few days. I've just been so used to it for so long that I don't automatically realize that I feel aweful because I have been isolated too much. So to be more specific, I can a day tops without ill effects.
How long can you go without alone time?
A few days. It depends on who I am around. If it's people I am close with, I can go without it for a very long time. Really all I need is an hour or so (usually) of "down" time where I am with my own thoughts doing my own things, but people can be around me while I do that.
What situations drain you the most--clubs, seminars, a weekend alone, parties, etc?
I am going to echo @EJCC and say boredom. It really messes me up. It's one of the core reasons I like to be busy. Other situations where I am forced to be quiet and just listen when I have thoughts in my head that I want to get out. Sitting quietly in meetings for me is aweful most of the time.
What energizes you?
Being active and productive! In otherwords, being busy. When I have a project, a goal, or w/e I am usually energized by it.
How long does it take to recover from a draining situation?
Either a few minutes, or a few days, it depends. If I am whacked upside the head really bad, it can take a really really long time. I'm finding that a good nights sleep, and a day of productivity is just what the doctor ordered. I should note: productivty is a pretty broad statement for me. Hanging out with friends, playing a game, or going on a hike feels like productivity to me. I mean, ultimately my favorite form of being busy is being busy having fun.