When I went away on my first ten-day meditation retreat I had no idea of the discipline that was required, or the endurance that would be called upon. Meditation often starts as a discipline of the mind, keeping it from wandering, bringing it back to attention, and keeping it within a limited area. This is Gevurah — discipline and limits.
As I found myself sitting for almost ten hours a day, and sometimes for an hour trying not to move, I experienced great pain. In my knees, my back, my shins, my shoulders. And the object of meditation at this point was sensation in the body, so the job was to observe the pain, without reacting to it. To endure the pain until it was no longer possible — and then try just a little bit more, since our minds will do anything to try and get us to get off the cushion. So this is the endurance of Netzach, the ability to stay on throughout, and then break through the wall of resistance the mind puts forth. This is also the Victory side of Netzach, since the victory meant here refers to what Krishnamurti refers to as the "only revolution," which is of course, the revolution within. To come through that inner struggle intact, we must pass through the day of Gevurah of Netzach, and use this strength and discipline to endure as a way of breaking through all the old patterns that keep us from experiencing Nirvana 365.