A Schedule-To-Close Timeout is the maximum amount of time allowed for the overall Activity Execution, from when the first Activity Task is scheduled to when the last Activity Task, in the chain of Activity Tasks that make up the Activity Execution, reaches a Closed status.
Schedule-To-Close Timeout period
Schedule-To-Close Timeout period with retries
The default Schedule-To-Close Timeout is ∞ (infinity).
An Activity Execution must have either this timeout (Schedule-To-Close) or Start-To-Close set. By default an Activity Execution Retry Policy dictates that retries will occur for up to 10 years. This timeout can be used to reduce the overall time that has elapsed, without altering the default Retry Policy.