Waits synchronously for the previously submitted work to complete, and returns if the work is not completed before the specified timeout period has elapsed.
- iOS 8.0+
- macOS 10.10+
- Mac Catalyst 13.0+
- tvOS 9.0+
- watchOS 2.0+
- Xcode 8.0+
The latest time to wait for a group to complete.
A result value indicating whether the method returned due to a timeout.