Here's a quick and consistent way of getting your hands on some legendary items. Do note that the 5 minutes is assuming you've got the damage output and know how to run through this efficiently.

MrWestTek's video:
   • How To Learn Legendary Effects Fast -...  

0:00 - Alternative Ways
1:17 - The Best Way
2:18 - First Area
3:00 - Second Area
3:22 - Third Area
5:03 - Teddy Bears
5:51 - Winners' Stage