The "Number of Months" field for the duration of a recurring coupon determines how long a coupon will remain in force once a payer checks out. For example, if a payer checks out on January 5th and the duration in months is set to 3, the coupon will affect the plan through April, 5th. This is true is regardless of whether the plan is set up to recur monthly, quarterly, or annually. Coupon duration periods are applied at the time of checkout, not at the time a plan starts.
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 Here are some example of how multi-month coupons would affect different types of plans:
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 For quarterly plans, assuming the plan starts at the time of checkout, you would multiply the number of quarters for which you wish to give the discount by 3. So, if you would like to give a coupon for 50% off the first 2 quarters, you would create a 6 month coupon (2 quarters x 3 months.) Keep in mind that if the recurring plan does not start immediately, you may need to multiply the number of quarters by 4.
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 For annual plans, assuming the plan starts at the time of checkout, you would multiply the number of years you wish to give the discount by 12. So, if you would like to give a coupon for 50% off the first 2 years, you would create a 24 month coupon (2 years x 12 months.) Keep in mind that if the recurring plan does not start immediately, you may need to multiple the number of years by more than 12 (depending on when the plan starts.)