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Sales - Monthly charts - View Post

ioi said:
It covers whichever weeks falls in their majority (i.e 4 or more days) in that month - so yes it may be 4 or 5 weeks depending on the month. I will add a date range at some point.

Note, they are not the same (necessarily) as NPD / Famitsu / other "months"

 Oh I know.  That's why I said in a nutshell.