On my gap year program, I lived with 37 other people. From September-April. We did everything together. Large communal dorm rooms, too, so no private rooms. I thoroughly enjoyed it, actually.
And while when I'm at home I span from seeing friends every other day to going 6 weeks during the busy semester without contact, on this program when the conditions warranted (which, was, always) I regularly socialized all day, every day 24/6 days a week, and only took off one large chunk of time per week (like, 4-6 hours in one stretch) to myself. I could last longer if our schedule was packed, but then I'd get a bit grumpy.
And I'm sure I would have been typed ENFx by my behavior if those people didn't know that I needed that large chunk of time every week. In fact, I appeared so ENF that people were seriously concerned about me for the first few months when I weekly took time to myself; they all thought I was desperately homesick or struggling with something because I needed "alone time". It never occured to them that I was an introvert and I had to flat out explain it. (But I didn't know MBTI until the end of the program when we all did it together, so I explained it with "if I don't do this, I will become Uber-Bitch"). And it took them months to believe me.
And, like I said, at home I'm comfortable going sometimes 6 weeks without contacting friends. (although this is somewhat rare and I do live with people, so I'm not a total hermit.)