Millis() / Unsigned long subtraction not working

[rant]
I do wish that users would lean to use the forum software correctly. Quoting a single word is not helpful when replying to a post with 123 replies unless it is obvious which post you are replying to

To reply to a particular post use the reply link under that post and the reply will include a link to the original which makes it easy to see the context.

Using the Reply button at the end of the topic acts as a reply to the topic as a whole with no link to the reply being responded to
[/rant]

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