Averaging 2 mins per run
Step 1: Go to Inferno difficulty, Act IV, Quest #4 "Prime Evil"
Step 2: Use the waypoint, travel to "Crystal Arch"
Step 3: Run through the portal.
Step 4: Run through the hallway.
Step 5: DO NOT TALK TO LEAH!
Step 6: You will find Zoltun Kull, Magdha or Mira Eamon. If Mira shows up, leave the game and repeat the first 5 steps.
Step 7: After Tyrael defeated the boss, pick up the loot and recall.
Step 8: Use the waypoint, travel to "Gardens of Hope - Level 1"
Step 9: Destroy everything on the first plateau and pick up loot.
Step 10: Enjoy loot/gold.
Zoltun Kull: If you want to bug him out, you need to move quickly. He will chase you around the pillar with Tyrael behind him. Run in small circles so he tries to turn around. If this happens, Tyrael will block his path because his hitbox is HUGE.
Maghda: Let Tyrael tank the poison bolts, wait 20s, pick up loot.
Mira: If you don't have gear or if you are in your MF gear, DO NOT fight her. She will spawn adds and use mortar to oneshot you. Simply not worth it.
If you want, you can try to explore the first room behind the boss. 1 or 2 chests can spawn there.