Sunspot cycles are 10 to 12 years in length.
The Sunspot Cycle, from minimum to maximum and back to minimum again. You can see the daily sunspot number at www.spaceweather.com.
The sunspot cycle is about 11 years long. This can vary somewhat; the current cycle has had an extended minimum with very few sunspots for about 3 years, and even now the sunspot numbers are very low for this point in the cycle.
Solar phenomenon such as solar flares.
There is a solar phenomenon believed to be affected by an increase in sunspots. Most solar flares are believed to be linked to an increase in sunspots.