1. 20 years
2. I was $50k in debt in 2007, now just $35k, so somewhere between 100% and infinity..
3. Depends on the definition of profitable. I probably get about $5,000 in app royalties during a good year. By the time I get the money though, it's already gone to other things.
I'm being facetious but only slightly - it seems to me that a lot of hackers have been doing this their entire lives and it's going to be a while before they are profitable.
I've been bootstrapping since Nov 2010 (repairing old Macs and contracting) and there has been a tidal wave of change washing over the industry with new freelancing matchup services and funding opportunities like kickstarter. I feel like I've been ramen profitable for about a year and really feel close to a breakthrough in the next 3-6 months. If I could just find a nontechnical benefactor, it would sure be a lot easier.
What's kept me going is the thought of working at a day job for years, only to break even (been there, done that). There are more important things in life than money. I garden now and ride my bike instead of drive. I think perhaps society is starting up as well.