All alarm acknowledgements (regardless of severity or drill down) took minutes to be recognized. Acknowledgement on the Windows side is fast (in seconds).
If re-creating the connection, it may throw the following error
Timed out attempting to connect"
"Cannot connect to SQL Server instance '<instance_name>' : Timeout expired.
The timeout period elapsed prior to completion of the operation or the server is not responding. : The
wait operation timed out [0xFFFFFFFE]"