Excluding my husband, about 10 days. I am "Miss Introvert, USA", so I would have gone longer with no problem, but I have to check in with my mom and make sure she is behaving herself. :)
I work outside alone so I don't see a human for 7 to 8 hours each week day. I've been working that way for years if I didn't have my deer friends to talk to I'd probably go nuts. Cheers!