3.1.2 Timers
Each entry in the Cloud Table has the following timers:
Cloud Cleanup Timer: This one-shot timer is used to remove state for a cloud after the state is no longer needed. The duration SHOULD be 15 minutes.
Maintenance Timer: A periodic timer used to perform periodic cache maintenance. The period SHOULD<1> be 15 seconds to keep the cache functional.
Message Retransmission Timer: This conceptual timer exists for each entry in the Pending List, and is used for retransmission. The period SHOULD be one second.