you can probably filter your dashboard resource on the lastsystemuptime value to get it to delay.
something roughly like
You may need to play with that syntax a bit but it will be close to that
where do i find and change the lastsystemuptime value
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You don't change it, the nodes table tracks the last time the node was polled as being up.
I got into my lab and tested it for syntax, this one worked
So it won't display any down nodes until they have been down at least 60 minutes