Then they will keep at this and play cards in between at least until someone comes to tell them to stop.

Playing cards is permissible, though there isn't actually a table in the hall so they will be sitting on the floor to do it.

They can catch bits of incoming reports, when a shift change makes it so the report taker is a different lieutenant who prefers to stand in a different place. Mostly there's nothing, sometimes there were footprints and they investigated and there was nothing, one party reports a group of three stunned dretches they took out with no incident.

Well, Fia promised a full day, so if no one comes to break them up for a 'sleep' shift that seems fine for now.  As long as people occasionally pass by with full bellies.  (Sometimes they will want to break for five minutes for whatever passes for a bathroom here but it would be surprising if that weren't fine?)  They can also copy unstiffness so the lack of table is not that inconvenient.

The outgoing patrols are usually recently fed. Nobody comments on the bathroom breaks if they time them responsibly.

A full day is long enough that some people encounter them twice, by the end of that period, and are notably cheery about their presence, having put together that these guys are why they get Endures even for patrols in the daytime when the wind isn't ridiculously awful! This takes the form of fairly subtle facial expressions and also someone trying out some kind of stupid nicknames but with an attitude that they'd be better nicknames if he could think of any.

What nicknames specifically??

There is a slant rhyme available in Chelish between "wand" and "million" but it makes a stupid nickname whichever order you put the words in! "Slot" and "prince" alliterate but this is immediately identified as a dirty joke and shot down by the guy's squadmate!