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I suppose that depends on the individual, their life situation (single, married, college student, full time job, etc), and how long they can stay excited about their idea.

I'm curious about how long the OP specifically has been pulling these 49 hour additional work-weeks.

I'm at about 6 weeks now, and counting. Part of the reason I need to do this is that I'm a relatively novice coder so it takes me 2-4x as long to do anything as a 'good' coder would. I understand, this kind of work is not sustainable, but it's very satisfying to get so much done while still working a day job. And of course, this has a ton to do with my life situation... single, living a long way from family, few friends - this would clearly not work for most people.

Not only will you quickly burnout but that kind of intensity makes you very susceptible to getting sick. A couple of sleepless nights from stress and one crowded bus ride -- wham! -- you have a flu bug.

If you get bored with a project in 2 weeks then I would not try to build a business around it. If your current job is not overly stressful, then you should be able to do this for 6 months to a year.