Since WordPress 3.5, there are build in time constants to make thing easier for you. They are
MINUTE_IN_SECONDS
HOUR_IN_SECONDS
DAY_IN_SECONDS
WEEK_IN_SECONDS
YEAR_IN_SECONDS
You can probably do 30 DAY_IN_SECONDS
for a 30 day period or 4 WEEK_IN_SECONDS
for a 4 week period. Obviously, for a 2 month period you will do 60 DAY_IN_SECONDS
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