Trending Limits Without Historian?

In terms of trending, what level of capability is available in Ignition WITHOUT having the tag historian module? Can tags be trended indefinitely as long as the server/client is not shutdown? Is there a time/data limit?

None.
Or rather, you’d have to use database pens and either manual recordings or use the SQL Bridge module.

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You could simply remove that module from your test setup to see what you get.