These cycles are the largest that we are aware of. The Kondratieff Cycle is one of the longest well documented cycles we know of, spanning a staggering 54 years, on average.
The Kondratieff wave is often broken into nine-year Juglar cycles. These cycles are of little practical use in terms of trading, for two reasons: First, they do not peak and trough very often. Second, the longer the cycle, the more variation there will tend to be in their times of peaking. In some instances, there will be a climactic event, but more often, there’s a slower process that can only be identified for certain sometime in the future, long after the cycle has completed.