(a) Reasonable time is question of fact. Except as otherwise provided in subsection (b), whether a notification is sent within a reasonable time is a question of fact. The limitation of the rule in subsection (b) to transactions other than consumer-goods transactions is intended to leave to the court the determination of the proper rules in consumer-goods transactions. The court may not infer from that limitation the nature of the proper rule in consumer-goods transactions and may continue to apply established approaches.
     (b) 10-day period sufficient in non-consumer transaction. In a transaction other than a consumer transaction, a notification of disposition sent after default and 10 days or more before the earliest time of disposition set forth in the notification is sent within a reasonable time before the disposition.