Can someone please let me know what the commendation cooldown is for dungeons? It's literally the last thing I need before Grandmaster Nightfalls for Guardian Rank 10. I'd just like to know when I should next do a dungeon because today I ran a dungeon (I otherwise would not have run) purely because "leadership" is tied to guardian rank 10. I need to actively chase it this way because people do not commend unless you remind them. Can anyone confirm the cooldown time? Is it an hour? 3 hours? 30 minutes?