Kundalini may seem to be more active at some points than others, but the changes it brings seem to be permanent. The broader process it ignites seems to continue on, even if no substantial symptoms are apparent.

There seem to be "events" that occur along the way, which seem to herald sudden, pivotal changes, or evolutions in the process. But the body-mind then adapts. I've had symptoms disappear for a few years, only for the process to ramp up again years later. The terrain / perspective / symptoms continually evolve along the way. The early months seem to be the most dramatic, many changes. Staying grounded and centered is very important during the peaks. The longer haul is much less eventful, but no less interesting.