Of course, some people will want and take more than "decent", some people are disabled so its unreasonable to expect and unfair to demand for them to contribute the same amount, some people genuinely like to work all sorts of jobs (including hard labor), and speaking of, there are different jobs and no one way to quantify their "work".
But this is a good starting point to answer the question: how much work is "enough"? With modern knowledge and medium-scale factories, can people spend 15-hour weeks producing enough to live comfortably, or do you need the average person to work 20-hour weeks of hard labor (or have 1/3 of the population work 60-hour weeks)?