[bediger4000]

I believe you're thinking of "endlessh" - https://nullprogram.com/blog/2019/03/22/

I have endlessh running on my internet-facing server. Here's the current suckers:

p222149-ipngn200203toyamahon.toyama.ocn.ne.jp:45763

14.33.133.188:59757

121.204.198.213:53240

I think all those have stayed connected for some days. But a lot scanners don't fall for it anymore. Since July 17th, I've had 60868 ssh connections, mean 195.817 sec, median 19.124 sec, max 886283.605 sec. The distribution is skewed much shorter than 10 days, however. Half the connections last less than 20 seconds, by eye around 15. 25% of the connections last between 30 and 40 seconds, and about 10% last around 50 seconds.