Most of what Workaholics said is right on the money. The nature of Ep temperament requires some level of energy recharge, as irrationals energy levels tend to vary erratically throughout the course of a day. Ij temperaments are much more staunch in that their energy levels are maintained at roughly the same low amount throughout an extended period of time. Plus ENFps are generally regarded as the "shy extroverts," which I suppose is the nature of Ne leading.