I did a 10-day Vipassana several years ago, so I'd say 10 days at least. My main issue is that I get worried about my family if I don't have news from them for days, but I also know that I'm (just like anyone else) capable of adapting.
So if I have a reason, I can survive for as long as its needed.
0.1 day maybe LOL can't stop using my phone especially we're trying to boost our online present. I can however, live w/o my phone for weeks when I wasn't running this startup. Well... as long as my husband is with me :p
Since I started muting my phone while I'm working, I realized I could live without it for hours without even remembering it exists. Next step, I want to try to get rid of it for the entire weekend. Let's see if this works.