How much time do you have to spend alone? How frequently?
I spend 95% of my time alone in my room, but I have been hating it a lot lately. On the first of the month I flew to Los Angeles to meet up with some friends (and to attend AX 2008) and I was around them nearly the entire four or five days. I did get to the point where I had to wander off by myself for a couple of hours. I felt light headed being in a room with so many people and nearly passed out while I was walking through the aisles.
What does the required amount depend on?
How much I am around people, how much I talk (I am generally a quiet person, to a lighter extent when around friends), and just how draining the other people are. It also depends on what is on my mind as well, if I have something on my mind that is bugging me I won't want to be around people at all, and will end up annoying them at how distant I seem.
What do you do when you are alone?
Listen ot music, watch anime, talk on IRC/IM, play computer games, browse the internet, think about random things.
Do you ever feel you have been alone too long
Now that I am back home I have been feeling very lonely. It was so much fun hanging out with friends that now I can only talk to via the internet and am stuck being back alone in my room for the most of my time.