I think the "apart from checklists" caveat in your question makes it difficult to give you the answer you want. Astronauts aboard the ISS have a checklist that they have to complete for basically every mission activity (here is the NASA checklist for EVA), especially if its related to the outside of the bulkhead.
Page 54 of that document makes it seem as though crewlock repressurization is designed to take approximately 15 minutes- 5 for prep, 10 for the actual repress process, and then I'm sure there are plenty of time consuming activities during the Post-EVA process.
If you feel like skimming through the rest of the EVA manual, you might note that some airlock pressurization criteria are things like "Wait until |dP/dT| < 0.04 mmHg/min" or "Wait 25 seconds." This leads me to believe that there are some opportunities for conversational chatter/dirty jokes with the comm officer, but it probably depends on who's in the airlock (and on the other end). Besides, there is a lot to be focused on when you're running through these mission procedures, so I doubt ISS astronauts are bored in there. They do have to record instrument readings and do maintenance checks.
I know if it were me, I'd be far too transfixed by the upcoming (or recently completed) space walk to talk a lot about the weather down below, meal plans, or family, but hey...people can get used to anything. I'm sure to some of the more experienced spacewalkers, it becomes routine.