Is the graph saying sun spots are getting shorter in length of time?
It's kind of complicated.
[National Earth Science Teachers Association] The length of the sunspot cycle is, on average, around eleven years. But the length of the cycle does vary. Between 1700 and today, the sunspot cycle (from one solar min to the next solar min) has varied in length from as short as nine years to as long as fourteen years.
[Journal of Atmospheric and Solar-Terrestrial Physics] Relations between the length of a sunspot cycle and the average temperature in the same and the next cycle are calculated for a number of meteorological stations in Norway and in the North Atlantic region. No significant trend is found between the length of a cycle and the average temperature in the same cycle, but a significant negative trend is found between the length of a cycle and the temperature in the next cycle.