My experience is that it more or less depends on your goals. I tried to do the 4 hour workweek thing and it worked... kind of. As others noted, it probably is possible to support yourself in a frugal lifestyle in 4 hours, but you're still left with the question of what to do with the other hours of the day. I've seen enough startups up close now to pretty confidently say that if you want to succeed in the startup world, its gonna take some 100 hour weeks. So, if you want to do a startup, you'd better make sure you love what you're doing.