One of the downsides of having your own business is trying to fit in vacation time. We tend to feel like we're indispensable and small business owners are notoriously bad at delegating. I recently went away for a mini-break and was vaklempt when I discovered that I didn't have any cell phone service.
It is, however, important to take time off to avoid burnout, maintain balance and improve productivity. It also makes you more interesting (and gives you something to talk about with your clients.) Even a weekend off can be rejuvenating. Of course, this is much more difficult when your business is still in its infancy, however the owner of a more mature business should be able schedule time off regularly. One of the primary reasons for going into business for ourselves is to make our lives more fulfilling, and regular vacations are certainly one way of making this happen.