This is quite a long dungeon as you have to free Thrall, wait for him to slooowwly ride to Tarren Mill, and go through several RP scenes with him before the final boss spawns.

Nonetheless, there are quite a few ways to speed things up:

1. Instead of talking to the Dragon who flies you to Durnholde Keep (in about 1m30s), you can just ride there, or use the Oddly-Shaped Horn (fast temporary mount) to get there MUCH faster (~35 sec).
2. In order to free Thrall, you only need to set fire to the buildings, you don't need to defeat the 1st boss, so you can just skip him.
3. You can use Nitro Boosts / Gunshoes to get to the next destination faster.
4. DBM lets you talk to NPCs faster.
5. If you kill the spawned dragons faster in Tarren Mill, the boss will come down sooner.

Maybe there is a way to give Thrall a speed boost, but I haven't found anything yet. Let me know if you do!

The Barrels inside each house are always in a random spot. There are 3-6 different spots they can spawn in, depending on the house. There is about a 1/1200 chance for ALL of them to spawn in the best position (next to the door), making this dungeon quite RNG heavy if you want to get the perfect time. Therefore sub-8m30s is most likely possible, even with the same strategies.

Items used:

• Wearing: Lv70 full Mastery crafted Dragonflight gear, 3x Azerite Armor with the Longstrider trait, speed enchants
• Before entering: Fried Bonefish, Charged Phial of Alacrity
• During run: Oddly-Shaped Horn (temporary mount), Nitro Boosts, Gunshoes