Depends on how much you believe in what you're building. If you think it's really that great, you should jump in, slash your expenses to the floor, and work 10

Depends on how much you believe in what you're building. If you think it's really that great, you should jump in, slash your expenses to the floor, and work 100 hours per week. Particularly if you have no family / kids to take care of; you can afford a greater level of risk. If it's not that great, consider not doing it at all. Save your investment (time, money, heart, etc) for something better that will inevitably come along. If you're not willing to suffer intensely, if necessary, for what you're building, it might not be the right thing to dedicate your time to. Sometimes it takes an extreme amount of sweat to get to the finish line, you have to factor that in if you're going to run the race.