Vacations and time off for rest and re-creation are as important as hard work.
Louis Brandeis, who was a Supreme Court Judge in the early part of the twentieth century, used to say, "I need rest. I find I can do a year's worth of work in eleven months, but not in twelve months."
Think about it. There are breaks taken in every aspect of life. In sports, there are rest periods and time outs. In formal meals, you're brought a sorbet or something else to cleanse the palate before the next course. Religion teaches us about Sabbath rest.
Taking time off for R and R is not laziness. It is essential for good health, sanity, and creativity.