It's usually an issue every month for five months. Then in month 6 is the trade. Then month 7 is a break. Then the process starts over again -- so it would look something like this:
Jan - Issue #1
Feb - Issue #2
March - Issue #3
April - Issue #4
May - Issue #5
June - TPB
July - nothing
August - Issue #6
September - Issue #7
October - Issue #8
November - Issue #9
December - Issue #10
January - TPB
February - nothing
etc.