Normally, Batman 80 pg. Giants came out every May and November. The wild card is # 185, which came out in Aug. 1966 (while the movie was in theatres).
In the 93 issue history of D.C. Giants, that was the only time one hero got 3 books in one year.
By the way, what did you think of "The Eraser That Rubbed Out Batman"?
How many return visits did that villain get? ;)