Business owners have more income than workers, so often they can afford time saving technologies in their personal life (eating out instead of cooking, childcare, etc), which allows them to put more time in their business. This may also be a factor in how hard they appear to work. Because your average worker doesn't work a small amount of time.

Furthermore, in the case of business owners, their work directly adds value to their wealth, but in the case of workers, working more than what is necessary often doesn't increase your income at all. So there is an actual incentive for business owners to work hard.