hm I would consider Arizona to have 6. Even if it was multiple covers for one edition. What about magazine collectors who actually buy the mags, not just look at them online? to them it would be 6 covers, not 4.
^ I really don't think multiple covers for one month should count as more than one. One month with, for instance, 3 covers isn't the same as being featured on the cover of a magazine on 3 separate occasions.
what about the people who actually collect the mags in their hands, wouldn't each cover they have to search and pay money for count as separate? Sometimes its' different photographers,editorial content etc.