Edited to add: inclusion should be near instant, or maybe 10 seconds at worst. If it is longer than this, something is wrong somehow.
The below would be a good start. I suspect that you have ghosts or other basic Z-wave issues.
What info to provide for troubleshooting assistance:
- How is Hub being powered? Supplied power block or other (explain)
- PoE power (with splitter) is known to cause major Z-Wave issues on the C-8 hub.
- See this post for detailed write up on PoE testing: PoE and the C8
- Provide screenshots showing entire Z-Wave details Page
- Hub should be running for at least 12hrs without reboot, and state how long in your post (you can find uptime on Logs > Device Stats)
- Click the Refresh Statistics button, wait 10 seconds, then Refresh the page
- Provide screenshot of Z-Wave Topology Map (red/blue squares)
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Also, are you on Z-wave JS? Look at the top left of the Z-wave page, and see if there is a button to (paraphrasing) to revert to ZIP gateway.