Heya folks! 
1 minute auto-closing is working as expected for me, with the caveat that I’m using a sandbox with no other activity. Also using 2.9.0.beta3, so maybe this was fixed.
When I set the auto-close topic timer to 1 minute, I get the following message immediately upon publishing:
Then 10-15 seconds later it changed to:
And finally:
As for that caveat: I’m the only one using this site, and I wonder if these are queued if a site has a lot of concurrent activity…
Or maybe it’s just been fixed! 