While there is a lot of yackety-yak about “Black Friday,” the blackest days will likely be December 11th, 18th and 23rd. If you want to avoid lines at the payment register try November 29th and 30th, as well as December 6th and 7th. MasterCard says its historical holiday data shows that the last Monday and Tuesday in November, and the first Monday and Tuesday in December are ideal days to shop between Thanksgiving and Christmas. MasterCard also says it records the least number of transactions per hour between the hours of 7 a.m. and 10 a.m. on those days. The busiest day of the year most likely will occur on Dec. 23 and the busiest hour most likely will be from 2 to 3 p.m. CDT on Christmas Eve. MasterCard also noted that the two Saturdays before Christmas tend to produce more volume than “Black Friday. MasterCard says it processed nearly 33 million transactions on each of the two Saturdays before Christmas — almost a million more than on the day after Thanksgiving.