If it's recurring subscriptions then partial durations are not permitted as the payment processors just don't allow it. I don't recall if it rounds or not, but it'll either be 182 or 183 days in those cases. For non-recurring payments it's just setting an expiration date based off the duration so it should take into account the partial days down to the second.
Kyle (Krileon) Community Builder Team Member Before posting on forums:
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