Assuming that you're referring to working x% of full-time for x% of the money, then yes. I could easily live off $300 per week, but even minimal wage gives me NZ$500 per week. A well-paying job should give me about $1000 per week. Under those conditions, I'd choose a 12-hour work week in an instant.

However, you refer to a 4-hour work week. That's not a lot of time. Assuming that I'll still make at least $300 dollars per week, then yes. Any less, probably not. I still have to eat.