Long wait MS RMI fetch notifications

Apologies in advance for my lack of knowledge.

I've recently setup the PSM on our system, and have a question about a recurring transaction which waits a long time...60 seconds. Attached is a screenshot of the tranaction/purepath. Can anyone shed some light onto what this is causing this? It seems to happen every minute, and I don't see anything listed in any of the logs which correspond to it. In general we have no errors, but this is clogging up my system health dashboard.

Cheers