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We are aware of the ability to increase shutdown time, but since Domino does not sense the reboot request and begin to shutdown automatically, the timeout is useless, you can set it to forever and Domino will not shutdown gracefully.
This is not a problem of Domino. The timeout for a service to stop gracefully can be configured in the Windows registry. Here is an example:
https://www.coretechnologies.com/blog/windows-services/increase-shutdown-time/