Hi, During the most recente solar minimum that just pasted, 2009 had the least sunspots. The entire year had only 29 sunspots. Take an example, there were 31 days btween the first sunspot of the year on Jan 10, 2009 to the second sunspot on Feb 12, 2009. Don't know whether that's the longest period without sunspot, but I guess it's quite common in 2009. If you are interested, I can give you a archive site, you can go find out yourself.