Does the auto-close option only take a positive integer for the number of hours? This makes sense, but there’s a (jobs) category in which I hope people will only be able to post topics in, with no replies. I tried inputting 0 to no avail.
AI-generated summary
The discussion revolves around the auto-close feature for topics. jgujgu inquired if the auto-close option can be set to 0 hours to prevent replies in a certain category, but it’s currently not supported, as confirmed by codinghorror. vinothkannans expressed interest in implementing this feature with low priority. Mittineague shared their experience with an “auto-close in 1 hour” category and suggested that a zero-hour setting would be beneficial. However, Vaping_Community pointed out that it’s possible to set the auto-close time in minutes using decimal values (e.g., 0.5), which vinothkannans confirmed as a viable workaround.
This is not supported at the current time.
I like to implement the support for 0 hours setting. Added to my list with low priority.
We tried an “auto-close in 1 hour” category as a type of “no moderation queue category” work-around for a while. IIRC it worked fairly well (HAWK may remember better) but a zero-hour would have eliminated the rare few that got replies. The category didn’t work for us (an unrelated reason) but instant-close could be good for those forums that need it. 
It is possible to set it for minutes rather than hours using .n values
ie. 0.5
Yes, it is possible now.