Werk #8153: Fix notification delay if delay is greater than 2147 seconds

If you configured a notification delay of more than 2147 seconds (approx 35 minutes, precisely 2^31 micro seconds) then due to an internal range overflow the actual delay would be somewhere between -2147 and +2147 seconds. So in some cases the delay was just too short, in other it was negative and that way totally ineffective. This has been fixed.

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