The quest has to be run 200 times.
Running the quest once takes 300 energy.
It takes 60,000 energy to complete the quest.
*The quest must be completed 50 times in order to get the maximum number of Pendulums.
*The quest can only be completed once per day.
(This means if you get the quest to 99% completion at 11:59pm and run it the final time after Midnight. It will not allow you to start the next run through until after Midnight the following day.)