Mo. Rev. Stat. § 400.9-612: Timeliness of notification before disposition of collateral.

(a) Except as otherwise provided in subsection (b), whether a notification is sent within a reasonable time is a question of fact.

(b) In a transaction other than a consumer transaction, a notification of disposition sent after default and ten days or more before the earliest time of disposition set forth in the notification is sent within a reasonable time before the disposition.