https://www.fflogs.com/reports/XWpmY3GqFt1P8Mhj#fight=12&type=damage-done
Looking through O4S clear parses, I saw that this one is over 19 minutes long. Enrage for this fight is ~12:30. It looks like around the 7:00 mark, there was a wipe and the boss resets to 100% health.