I missed the spot that RareWhiteTRASH mentioned but I found another good spot for this:
At the beginning of chapter 4 just walk down the hall until you see a big 5 on the wall. Follow the hall around the right to the back of the wall with the 5. There will be a drone and Nillin will say something about it. Just walk up to the drone, it will kill you and you will respawn right there a few steps back where Nillin comments on the drone, Took me probably less than 2 minutes to get this. Loading after dying was the longest part.
I hope this helps. Good gaming